The great folks over at Trellian (Becky, Larry, Hilton, Dave & company) have released a free version of their Keyword Discovery tool. This is great news in light of the Yahoo/Overture current tool outages (with no plans to be fixed) while we all patiently await the arrival of a new Yahoo keyword tool.
The version gives you up to 100 results for the keyword you enter, with the number of searches logged and variations of the keyword. It's basically just like the Overture tool, but based off of Trellian's data collection.
I'm a big fan of Trellian's Keyword Discovery. It is a great tool that allows you to get a better handle on a lot of different aspects of a particular keyword or groups of keywords. It's well worth the subscription price for the full version that gives you insight into search engine market share for a particular word, seasonality and how tight the competition is.
Give the free version a try - you'll soon find you'll want the full version!