Damn, could have used this on an educational video game concept I was involved with a few years ago. Finding the right people for projects like that is so damn hard in some parts of the country.
I found it quite hard to search for say, a programmer in city X. The location control didn't seem to work at all, after failing with my city name I tried "the moon" and it just came back with the same people and no feedback.
thats an interesting concept - except how do you control the amount of spam/noise that would eventually overtake the site if it becomes at all popular?