Keywordcountry.com is a great tool. You get a 7 day free trial with full functionality but you have to enter papal address and then cancel before they charge you (7 days) if you don't want to pay.
I've just review Google Cash Detective over at SpeedPPC.com. It's really changing the whole affiliate game. At least the PPC side of things.
I still say the Google Adwords Keyword Tool is best. People may disagree, but most don't know how to use it properly.
See, SEO and SEM are the different things. if we are talking about SEO, try to use relevant keywords in meta tags. as well as get one way link from good PR websites. try to post on blogs, directories.. it will help you a lot !
Thats a very common misperception. Tools like Market Samurai pull data from Google through API,so its the same words, but what you don't have in google is ability to analyse those keywords, analyse their competition, commercial viability, etc. Its the ability to do the proper analysis on those keywords that makes professional tools like Market Samurai superior then just looking at the list of keywords that you'll get with google tools. If you want to dig a hole in the ground, you can do it with your hands, its slow, painful, but you will do it at the end..... Or you can get a shovel.
I really like Market Samurai. I have tried almost all of the different tools, but MS has been the best I have seen so far. It has a very clean interface, it is easy to use, and is truely an all in one SEO tool. Not to mention its reasonably priced and only a one time fee
I always prefer Google Adword it is very friendly tool for keyword selecting and its accurate no doubt. Maximum webmaster use this tool for keyword research.