So long as I'm here, I suggest:
The Adventures of Dr. McNinja
El Goonish Shive
Harry Potter and the Methods of Rationality
Luminosity If you like Methods of Rationality, then please give this a shot. It is really difficult to get people to read it because of what it's fanfiction on, but you do not need to know or have any positive feelings for the books this world originated in. Though you can--it doesn't bash the books, either.
Not Always Right
Saturday Morning Breakfast Cereal