SEO Book has a keyword research tool I have been using for some time now.  Whenever you need  to do some SEO research like finding the most search keywords from a number of search engines like Gooogle, Yahoo, and MSN.  Why focus on keywords that aren’t highly searched or sought after, when you can better define your webpages and content towards topics that are more likely to get sought after in the top search engines?

SEO Book is powered by Wordtracker, one of the best ways to research keywords.  Keep in mind that this is the basic verison and of course you won’t get all kinds of features in this tool .  However you can supplement this with other research tools like google adwords tool.

To use SEO Book Keyword suggestion just visit this link