eloog, it’s important to understand where these tools are getting their data from. Overture gets their information from the previous month’s search query data from sites like Yahoo and many others that Overture supplies. Since the Overture Keyword Suggestion tool is so popular among the SEO community, it is widely believed that their information is skewed due to many automated queries from the SEOs themselves, as well as how they count some of their search queries. Apparently some sites that run pop-up windows get counted in the searches. Wordtracker is considered a much more reliable source for keyword information in so much as their data isn’t as skewed. I’m not sure exactly where they get their data from, but it is from a smaller sampling of information. In either case, no one has cracked the code for extrapolating exactly how many searches are done for a keyword. This is mostly because Google doesn’t publish this sort of information, and in the SEO world, Google is just about everything.