I have just used a new site that I heard Leo Laporte and Amber MacArthur talk about on their show, Net@Night. The site is Hunch.com and it is a recommendation engine unlike any other out there. I searched on Geocaching, a sport I would like to get more involved in, and up popped several questions that helped me refine what I was thinking about. You don't need an account to use the site, but it helps to keep track of what you previously searched for and to better refine your results. Hunch.com was created by Caterina Fake of Flickr.com fame.
It's actually quite fun and I highly recommend that you use it.
All the best!