Music: Pandora
Ed Blachman sends word that Pandora is live. It's a spin-off of the Music Genome Project; you give it a song or an artist for a starting point and it builds (and plays) a list of music it thinks you'll like.
I gave it two challenges: Phil Ochs (it got Dylan, Seeger, and Martin Carthy) and The String Cheese Incident (which also wound up with plausible results). Impressive.