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If you know of a worthy tool that isn't listed, take a minute to [url=http://dmoz.org/cgi-bin/add.cgi?where=Computers/Internet/Web_Design_and_Development/Authoring/Online_Tools/Keywords]to fillout the form[/url].
It's sort of a "poor man's Overture search tool". When I'm doing exhaustive keyword popularity research using free sources, I try to use this tool.
Although it's often painfully slow and doesn't have the same searching volume as competing Google AdWords or Overture, it doesn't aggregate plurals & singulars (unlike Overture, a major failing in my book), so you can get an honest sense of the difference between searches for "keyword" and "keywords".