Pynchon Wiki
Wikis for the six Pynchon novels: V., The Crying of Lot 49, Gravity's Rainbow, Vineland, Mason & Dixon and Against the Day

The HyperArts Listening Room
Tones for your Bones...

The Modern Word
The ultimate "post-modern" fiction site, maintained by The Great Quail (aka Allen Ruch)

Mikhail Bulgakov - The Master and Margarita
Kevin Moss's Web-based annotation of this really quite amazing Russian novel written in the '30s but not published until 1967.

William Gaddis Site
Excellent resource for the Gaddis reader, maintained by Victoria Harding

The Don DeLillo Society
Excellent and informative website on one of America's great contemporary novelists.

David Foster Wallace Site
The Howling Fantods, it's called. And it's all about DFW.

Futurarium
The rest is history...

Mark/Space Interplanetary Review
Anachron City/Great Linkage

Argon Zark!
Read the whole damned comic!!! Great graphics!

Eric Weisstein's Treasure Troves of Science
Great resource for questions that may arise regarding all that technical stuff.