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WordTracker has a great free too: http://freekeywords.wordtracker.com/

Also SEOBook has a decent tool: http://tools.seobook.com/keyword-tools/seobook/

But yes, AdWords tools is among the best to find search volume. No one else has the data to offer the same information.

If you have a point of reference, I find Google trends useful as well. By point of reference, I mean you have some keywords where you know the actual click volume from personal experience, i.e. you rank 1st on that keyword.

Yeah I've used Google Trends and Insights a lot, just wanted to see what everyone else out there is using.

Seems to give logical numbers from what I've seen, How accurate they are I don't know, but they seem to be in the right sort of ball park.

Thank you. I've been using them, Google Trends & Insights and Exact Report (for rankings).

I personally think adwords tool is the best freely available tool right now. Spyfu and wordtracker are other options - paid. More expensive Hitwise reports, can't beat these in terms of depth and accuracy.

You should also check out google's new Search Insight at http://google.com/insights/search