I saw a lot of programs that claim that they can show you some search results from the Google's search database (or whatever it's called - I don't know the official term, but I'd like to find out). One example here: SeoDigger.com/ They say that have a 60 M English Base (is that a 60 MB English Database?), which looks to me to be outdated anyway. (I searched for one of my sites which is not online for month, but appears in their searches). How did they get that database? It's (publically) like the DMOZ's database which contains all their sites? The same question for WordTracker.com
I know wordtracker compiles data from low-tier search engines, like dogpile.com. Overture, now Yahoo search marketing comes from Yahoo, but I'm not sure where this data comes from. I find it pretty useless - I typed in a few URLs and most of the keyword phrases returned are 6 or even 7 words long.
didn't heard that someone has a goo_gl_e DB. There was a leak from AOL search a year or two ago, but not g_oo_gle
I have several words tested where I do receive more daily traffic than it is predicted by those applications - and I am not even on high positions for these keywords. Their lack is to not have access to google (and this is even more relevant when it goes out to for example my country, where google has a market share of over 90% in search) you can use these databases for rough, very rough estimates in the sense of 'if people search for this, they might search also for that' but in general I rather trust the google search tools from adwords and trends. you do not get numbers and they are not as sophisticated as some of the tools, but the best algorhythm has no use when the database where it is applied to has not enough data. the aol database is interesting to look at from a whole point of view, to make a connection / corellation between different search patterns AND it is good to look at the search patterns of a normal aol user - which in many cases is also a typical customer clicking on ads.