A site in india, jaagore.com(means wakeup), allows people to volunteer for a good social cause, or start a movement themselves. I think this domain could be helpful for similar site. You can also make use of Facebook/Twitter api to bring the social element into it.

Another use that comes to my mind is to use this domain to power a review site, may be a community powered startup review site where hackers, designers and entrepreneurs can review startups and provide suggestions for improvement. Think over this. If successful, it can turn into a good place for budding entrepreneurs to look for relevant information.