Descent Series

Descent 4 News
Contains information on Descent, specifically a timeline, concept art, interviews, source code, and news.
http://www.descent4.org/

Descent BB: the Community Forum
The Descent Bulletin
http://www.descentbb.net

Descent Maximum
Consumer reviews.
http://www.epinions.com/prices/Descent_for_PlayStation

DXX Rebirth
A source port of the Descent and Descent 2 Engines, provides classical gameplay combined with OpenGL graphics and effects along with new features.
http://www.dxx-rebirth.com/

Planet Descent
Includes information for all three games plus forums and files.
http://www.planetdescent.com/