Publicly avalible datasets

I teach a class on Processing, which is a simplified version of Java designed to enable people to easy create graphics. My class focuses on data visualization. Below is my list of publicly available data sets which I encourage my students to use in their visualizations.

IMDB

IMDB is a website that maintains a list of movies, actors, actresses, and information about them. They offer a set of downloadable information sets. The sets can be a bit challenging to parse though, so there also exists some Perl parsing scripts.

Other

StackOverflow has a list of publicly available data sets.

Blogs about data

Quota has an interesting question What are the best blogs about data?  with allot of good answers.