I heard about this on a Twit podcast and it sounds like a site I would definitely use next time I'm buying a gadget (or trying to fix one -- much more likely prospect).
Gdgt.com (pronounced gadget.com) is like Quora for gadgets. The tag line is: "Ask someone who actually knows. Better answers, support, and reviews from people who actually have your product." Founded by the small folks over at Engadget, gdgt lets you tap into the geek hive-mind to find out everything you want to know about your (potential) gadgets.
It's tied into social networks too, so you can ask your friends, or see what they've been writing/ asking about. Definitely on my bookmark list. Check out the video for more: