Update to add:
http://lesswrong.com - a site about thinking and belief
http://www.fanfiction.net/s/5782108/1/Harry_Potter_and_the_Methods_of_Rationality - a ridiculously good fanfic of the Harry Potter universe, only in this one Harry isn't a moron. I wouldn't pay to buy the normal HP series - but if this were in print, I would pay a lot to own a paper copy.
http://www.economist.com - news for people that aren't stupid. Substantially less biased than a lot of sources. Very reliable.