Aaron Wall has just posted that Wordtracker have launched new free version of their keyword tool.
Mike Mindel from Wordtracker commented about this to confirm that “We’re offering 100 results free, adult filtered with drill down into the long tail.”
This is excellent timing as the Overture keyword tool has been regularly unavailable for the last couple of days, although Yahoo! have confirmed that this has not gone but “the responsiveness of this free tool is diminished due to the sheer volume of hits it receives each day, therefore browsers may time out and error pages may appear but it doesn’t mean that this tool has been removed.”
Here is the Wordtracker keyword tool, this looks to be an excellent way to quickly find the popularity of search terms, based upon Dogpile.com and Metacrawler.com figures, and I especially like the way you can easily drilldown to the long tail results, as Mike said.