[skram]

Is there a specific type of data or industry you're interested in? There's a ton of government data floating around, a lot of which is located at http://data.gov/

Some other sites to look into: kaggle.com, http://www.healthmetricsandevaluation.org/ghdx, factual.com, infochimps.com

There's always the classic Netflix recommendation challenge from a few years ago too

[szcukg]

I'm inclined towards tv sitcoms/music data, but thanks for the links.

[skram]

Too bad Pandora hasn't done a data dump.

What about piggy backing off Wikipedia (which you ca download) or IMDB for seeing connections