b. y. o. pc.

The University of San Francisco is inviting all comers to bring a laptop and hook it up to the world's first "flash mob" supercomputer. Read more in this New York Times article. They're trying to break into the Top 500 (see "list in HTML" link) list of supercomputers. If this works, expect to see hundreds of colleges and users groups sending out the "y'all come!" to their student body to try to beat 'em.