It needs a more lightweight interface, dont let it to become just bloated like facebook, about com, or yahoo answers.
I like the voting system with + and - to add or discount points, but maybe something a little bit more advaced just like www.stackoverflow.com would be great.
OpenId login, it's a must-have and most-wanted feature for every community website nowadays.
Please, don't let it to become a bloated website. Nobody needs "instant messaging" capabilities on every website they visit. Don't populate all the pages with advertising.