Links
Wikipedia
I used to think that reading the encyclopedia was pretty dry, but then I discovered Wikipedia. the online encyclopedia edited by everyone. How else could I have learned about Jack Fruit?
BBC
The BBC seems to be a fairly good source of world news.
APOD
Astronomy Picture of the Day has a new astronomy related picture, uh, every day.
PHET
University of Colorado Physics Education Technology. The physics education research folk at UColorado have made some really great physics simlations and games.
POV-Ray is a free tool to make computer models and computer animations. You create shapes by typing text commands, s oit is a good way to learn to program, and a good intro to computer modelling.