Almost all of the universities here in NC have well-established college community websites. the best I've seen so far is:
www.thewolfweb.com
it has so many features it's ridiculous.
I know on thewolfweb you can even find rides to other universities with a nifty map locator thing. (if someone is driving across the state, for example, they will put it on the map, and you can call them and ask if you can come).
all kinds of stuff like that. forums, photo galleries, it's all there. check it out!
the one for my university is
www.partyapp.com
fun stuff