China related:
Chinese dictionary and resources
BJ Hikers: good hiking group in Beijing
China history
Interesting study on Beijing transportation history
Beijing housing study
Online Chinese dictionary for any level
Chinese proverbs
Aaron's school: Western Academy of Beijing
Free online translation

Ultimate
Beijing ultimate site
China Ultimate Players Association (in Chinese)
Hangtime (Beihang) ultimate site - (in Chinese): 北航队的网

Literary
Online Dictionaries
Another
Worldwide Words: good quirky vocabulary site
Books on line
LOTS of languages

Interesting Stuff
String figures
Yoyo tricks
World leaders: All leaders from all countries in history (well, close)

Technical
Beijing Linux users group
Linux is Obsolete: Neat historical debate on Linux from 1992 involving a lot of famous names
Lots of tech tutorials
ICDSoft: my web host (looks good so far)
Opera: much better than IE, better than Mozilla
My IE2: shell for IE2 browser that has much nice Opera functionality
Spamcop: report your spam here
SpamGourmet: great resource for temporary email addresses
Catharon: my once (and future?) employer
Very good C++ and Java books: free for download

More coming...