SEO Comparision: Overture, WordTracker, Keyword Discovery and Keyword Country

I've been using Overture, WordTracker , Keyword Discovery and Keyword Country for quite a while.

Overture's results tend to be highly skewed due to automated searches. Combine that with the lumping of singular and plurals and the incorrect ordering of many phrases and it loses it's usefulness.

WordTracker has a fairly small db, but it can give you some fairly good data until you get to very small niche phrases at which time it loses it's usefulness.

Keyword Discovery has a much larger db, but it is generated over time so, while it is larger and can be used to look for the smaller niche phrases, it loses it's usefulness when you are looking for seasonal trends.

I have recently started using Keyword Country. It is primarily marketed to help investigate Adsense payouts across various keywords, but there is some interesting info inside no matter what your purposes.

There seems to be a lag (~10 days) in their data and like all keyword tools some of the info is a bit suspect. However, it does offer a few items most don't and I have been spending more and more time with it. I used to rely on Google and Overture keyword tools exclusively and have used most of the others, GoodKeywords, Keyword Discovery, etc.

But for uncovering niches, bids, competition, eCPC, etc. Keyword Country is the tool right for me now.

Summary - None of the options are perfect. They all have their strong points and weak points, which is why I generally use all of them to get a good overall picture of whatever market I'm going after at the time.