External links

Useful

1. BOINC: Put your clock cycles to use.
2. Physics Forums: A decent place to go ask questions about physics and math.
3. Less Wrong: A public community forum with some interesting discussion.
4. HTML WikiBook
5. LaTeX WikiBook
6. Erowid

Entertaining

1. Streaming football match feeds
2. Online debate/discussions
3. Unusual humour
4. Visual illusions : Warning, might make you feel woozy.