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You should check out http://tungle.me, it's a much more complete product (calendar syncing, nicer UI)

I don't know. How "complete" do you need a one-off solution like this?

I'd have no qualms sending my friends or a work group to this site to solve a scheduling problem in a hurry.

http://doodle.com is yet another competitor.

Doodle is in fairly widespread use at my school