Official Site Good for overall information on venues, tickets, etc. Not much news coverage. Results update speed could be faster, for an official site.
ITTF site Provides results, draws, and news coverage.
USATT site Worlds coverage by USATT, with an US perspective.
About.com links A collection of English-language sites covering the Worlds.
Butterfly site: Nice site with short video clips from today's competition.
The following are in Chinese:
www.fishtt.com Probably the most popular table-tennis site in the world, and one of the best. Lots of photos, and two forums on the Worlds.
cn-tt.com The other great Chinese table tennis site, with lots of reports and photos.
sina.com.cn Collection of articles from various Chinese newspapers.