nobody can give exact answer for your question but you can use adwords keyword to check the search volume of a keyword
highest search volume, but then also highest competition: 1 5867 play games 2 5123 myspace 3 3419 yahoo 4 3381 google 5 3236 ebay 6 3063 music lyrics 7 3045 play game 8 2999 myspace.com 9 2416 mapquest 10 2372 youtube 11 2058 yahoo.com 12 2023 insurance 13 1698 finding dental care 14 1562 brooke mueller 15 1560 girls 16 1507 craigslist 17 1499 you tube 18 1476 game cheats for ps2 19 1439 baby boy names 20 1397 paris hilton 21 1388 sperm shack movies 22 1367 youporn 23 1287 hotmail.com 24 1243 facebook 25 1242 hotmail 26 1230 beyonce fall 27 1106 urban myths 28 1106 yahoo mail 29 1102 top offshore 30 1024 local newspaper 31 1008 britney spears 32 966 msn 33 931 tameka foster 34 925 www 35 919 aol.com 36 891 hot 37 880 newspaper obituaries 38 880 home depot 39 875 walmart 40 873 fergie 41 873 free lady sonia 42 847 carmen electra 43 820 dictionary 44 811 jenna jameson 45 808 wikipedia 46 794 google.com 47 789 linkin park 48 785 rihanna 49 777 jessica alba 50 763 games cheat 51 760 akon 52 741 harry potter 53 737 myspace layouts 54 735 www.yahoo.com 55 729 my space 56 728 gospel music lyrics 57 723 pamela anderson 58 711 map quest 59 694 ebay.com 60 689 lowes 61 689 halo 3 trailers 62 687 weather 63 686 maps 64 684 www.myspace.com 65 684 white pages 66 681 amazon.com 67 680 msn.com 68 677 bikini 69 675 anime 70 659 jessica simpson 71 656 lingerie 72 645 craigs list 73 628 webkinz 74 623 best buy 75 620 xtube 76 615 cnn 77 612 babes 78 610 lindsay lohan 79 606 shufuni 80 600 tera patrick 81 595 youtube.com 82 591 search engines 83 590 test 84 587 pictures of cats 85 587 avril lavigne 86 585 target 87 585 beyonce 88 584 nudist 89 573 sean kingston 90 573 naruto 91 572 thong 92 570 runescape 93 560 hey there delilah 94 560 thongs 95 552 shakira 96 548 eminem 97 547 map of iraq 98 541 toy recall 99 539 sports bloopers 100 534 jessica biel 101 533 raven riley 102 530 amazon 103 528 ipod tv 104 528 50 cent 105 522 obituaries 106 518 play pokemon games 107 517 yellow pages 108 517 sears 109 515 job nigeria 110 513 cars 111 510 lil wayne 112 502 vida guerra 113 499 fall out boy 114 498 booty 115 497 girl 116 494 airline tickets 117 494 asian 118 492 games 119 491 hannah montana 120 489 timbaland 121 484 panties 122 484 breasts 123 480 kat von d 124 479 play hunting games 125 477 credit report 126 472 gmail 127 471 ask.com 128 469 emma watson 129 464 song lyrics 130 462 mapquest.com 131 460 southwest airlines 132 458 madonna 133 458 free radio stations 134 455 lyrics 135 454 short haircut 136 453 youporn.com 137 451 aol 138 450 comcast.net 139 447 michael vick 140 444 marquess 141 443 hilary duff 142 442 pink 143 441 dogpile 144 441 free online games 145 441 www.hotmail.com 146 435 weather.com 147 435 funny 148 434 megan fox 149 434 mature 150 433 student loans 151 433 https hotmail 152 433 pornotube 153 430 abba 154 423 bank of america 155 423 dog 156 420 dogs 157 419 pokemon 158 419 free search 159 415 beautiful girls 160 414 umbrella 161 412 home video 162 411 pthc 163 407 ebony 164 404 justin timberlake 165 403 big brother 8 166 402 redtube 167 402 google earth 168 397 meaning of names 169 394 samuel blankson books 170 394 free english course 171 393 car rental 172 392 wwe 173 389 people search 174 388 circuit city 175 387 miley cyrus 176 385 family guy 177 384 angelina jolie 178 384 kelly blue book 179 382 driving directions 180 381 wicked weasel 181 374 play free games 182 374 scooter 183 372 playstation game cheats 184 372 transformers 185 371 christina aguilera 186 370 flowers 187 370 women 188 368 briana banks 189 365 aol mail 190 362 jennifer lopez 191 355 zac efron 192 354 love 193 354 metallica 194 354 sublime directory 195 352 jennifer aniston 196 351 badjojo 197 350 queen 198 349 pc game cheats 199 346 pam anderson 200 345 craigslist.com 201 345 my chemical romance 202 343 nasa 203 343 x games crash 204 342 high school musical 205 341 jonas brothers 206 339 search engine optimization 207 337 gwen stefani 208 336 postage 209 335 denise richards 210 334 cascada 211 333 monrose 212 333 free games 213 332 paramore 214 332 chris brown 215 329 american airlines 216 327 dans movies 217 326 boysfood 218 326 mika 219 326 news 220 325 bratz 221 325 jobs 222 324 limewire 223 324 nudists 224 324 music 225 323 facebook.com 226 322 google maps 227 322 travelocity 228 322 trish stratus 229 322 datasheet semiconductor 230 321 tattoos 231 320 simpsons 232 318 ask 233 317 expedia 234 316 ups 235 316 age of love 236 315 barry bonds 237 315 rammstein 238 315 myspace login 239 314 nickelback 240 313 bon jovi 241 313 hairspray 242 313 al4a 243 313 busty 244 313 obituaries newspapers 245 310 usps 246 310 bleach 247 310 bebo 248 309 kanye west 249 309 staples 250 305 kim kardashian 251 304 beach 252 304 www.google.com 253 302 mirthala salinas 254 301 korn 255 299 t-pain 256 299 office depot 257 295 topless 258 294 jobs in nigeria 259 291 fox news 260 290 verizon 261 290 baby names 262 289 jenna haze 263 288 bushido 264 288 zip codes 265 288 beatles 266 286 deaths 267 285 the way i are 268 284 united airlines 269 282 jordan capri 270 282 golf 271 282 hairstyles 272 282 xtube.com 273 281 amy winehouse 274 280 espn 275 279 utube 276 279 msnbc 277 278 realtor.com 278 278 imdb 279 276 costco 280 276 soulja boy 281 274 kelly clarkson 282 272 richards realm 283 271 breast 284 271 enrique iglesias 285 269 comcast 286 268 victoria beckham 287 267 play arcade games 288 266 green day 289 266 jokes 290 266 nudism 291 266 drudge report 292 266 katie price 293 264 mp3 294 264 walmart.com 295 263 stronger 296 262 black 297 262 yuvutu 298 261 maroon 5 299 261 latina 300 261 cnn.com 3. The top 200 long-term keyword report Our current database contains 343,411,424 search terms and represents the complete queries from the largest metacrawlers on the web (Metacrawler/Dogpile etc.) for the last 90 days. Nos. Count Keyword =========================================== 1 219565 myspace 2 162495 google 3 136340 yahoo 4 136126 ebay 5 128032 myspace.com 6 120396 play games 7 101288 game cheats for ps2 8 100792 paris hilton 9 96971 mapquest 10 94072 youtube 11 93300 play game 12 85326 games play 13 83268 yahoo.com 14 72806 girls 15 59477 linkin park 16 56486 craigslist 17 54754 you tube 18 53565 akon 19 48345 jessica alba 20 47577 ps 2 game cheats 21 47139 jenna jameson 22 46504 rihanna 23 46472 hotmail.com 24 46095 fergie 25 44013 britney spears 26 43381 hot 27 43358 yahoo mail 28 42893 facebook 29 42515 hotmail 30 41323 anime 31 40976 sperm shack movies 32 40373 msn 33 40348 pamela anderson 34 40291 carmen electra 35 39829 music lyrics 36 39782 home depot 37 39008 walmart 38 38320 naruto 39 38125 google.com 40 37300 bikini 41 37152 avril lavigne 42 37040 harry potter 43 36424 lindsay lohan 44 36334 airline tickets 45 36281 myspace layouts 46 36243 pc game cheats 47 36190 my space 48 36162 youporn 49 36076 wikipedia 50 35210 dictionary 51 34998 beyonce 52 34716 www.myspace.com 53 33967 fall out boy 54 33836 obituaries 55 33727 aol.com 56 33713 baby boy names 57 33099 games 58 32857 umbrella 59 32670 games cheat 60 32393 weather 61 32311 pink 62 32250 lil wayne 63 32151 eminem 64 32083 jessica simpson 65 31839 pictures of cats 66 31711 cars 67 31698 gospel music lyrics 68 31555 dogs 69 31336 lowes 70 30482 50 cent 71 29752 runescape 72 29528 maps 73 29421 test 74 29346 play pokemon games 75 29153 madonna 76 29140 map quest 77 28777 free e-cards 78 28575 thong 79 28191 jessica biel 80 28166 amazon.com 81 28154 flowers 82 28133 shakira 83 28081 newspaper obituaries 84 27629 webkinz 85 27620 ebay.com 86 27617 nudist 87 27162 best buy 88 27106 meaning of names 89 27028 search engines 90 26865 girl 91 26705 dog 92 26570 www.yahoo.com 93 26159 target 94 26124 amanda beard 95 26122 party like a rockstar 96 26069 t-pain 97 25901 pokemon 98 25756 funny 99 25710 babes 100 25358 craigs list 101 25332 lyrics 102 25149 thongs 103 24754 justin timberlake 104 24742 kelly blue book 105 24618 white pages 106 24598 asian 107 24513 ask.com 108 24499 msn.com 109 23977 wwe 110 23941 hey there delilah 111 23903 music 112 23901 metallica 113 23823 playstation2 game cheats 114 23729 vida guerra 115 23557 abba 116 23534 lingerie 117 23524 breasts 118 23469 amazon 119 23413 youtube.com 120 23322 dogpile 121 23194 free games 122 23104 free radio stations 123 23081 kelly clarkson 124 23062 transformers 125 22999 megan fox 126 22855 emma watson 127 22796 cnn 128 22544 my chemical romance 129 22521 sears 130 22510 raven riley 131 22405 xtube 132 22291 mature 133 22163 booty 134 22082 mika 135 22079 free lady sonia 136 21951 queen 137 21773 panties 138 21527 hannah montana 139 21025 bon jovi 140 20893 poetry 141 20657 girlfriend 142 20572 christina aguilera 143 20360 beatles 144 20294 southwest airlines 145 19965 hilary duff 146 19872 nickelback 147 19864 chris benoit 148 19847 maroon 5 149 19767 song lyrics 150 19703 baby names 151 19685 mapquest.com 152 19569 ebony 153 19465 free online games 154 19303 pink floyd 155 19295 tera patrick 156 19216 jennifer lopez 157 18966 yellow pages 158 18875 angelina jolie 159 18843 google earth 160 18834 love 161 18762 circuit city 162 18744 women 163 18559 family guy 164 18521 korn 165 18500 lyrics music 166 18454 shufuni 167 18280 sean kingston 168 18278 radio stations 169 18155 pornotube 170 18117 rammstein 171 18050 three days grace 172 18030 driving directions 173 18022 michelle manhart 174 17838 bebo 175 17358 carrie underwood 176 17303 gmail 177 17291 slipknot 178 17185 home video 179 17172 marquess 180 16975 acdc 181 16878 gwen stefani 182 16874 weather.com 183 16775 andrea berg 184 16733 amy polumbo 185 16609 comcast.net 186 16604 aol 187 16488 chris brown 188 16454 topless 189 16190 katie price 190 16186 limewire 191 16164 people search 192 16142 bank of america 193 16121 trish stratus 194 16106 cascada 195 16087 ask 196 15957 www.google.com 197 15946 amy winehouse 198 15860 blonde 199 15734 hairstyles 200 15633 imdb see: http://www.searchengineguide.com/wt/2007/0815_wt1.html better: look for high search volume and LOW competition KWs
Keep in mind this changes on a monthly basis for the most part. You can also check out Google Trends as well.