Perhaps not quite grandiose or revolutionary enough to meet the description at the top of this page, but here's my dead-in-the-water project:

http://ploya.com

It's supposed to be a community for finding out about and then getting into interesting internships or graduate jobs. It seemed to catch on a bit for a couple of positions, but has declined since then.

My own interest in the site dropped significantly once I got my final internship and graduate job, and I guess this generalises to most potential users.