Here is a new tool some people like, and some doesn't like. It's a bit complex for novice users, however I can't find the way to make it simplier and don't lose its power at the same time.

Free version doesn't count competition - this feature is avaialable in Professional version only, however free version is much more powerful than 90% of expensive keyword tools you can find today.

I'm developer of TheDowser (please look at my signature).