RPG Sheets
rpgsheets.com
Over 700 character sheets from over 200 game systems, including official sheets, custom and WebRPG.com sheets. Accepts submissions.
The Harrow
theharrow.com
Former roleplaying guide Dru Pagliassotti's archive of articles on roleplaying, gamemastering, and adventure writing.
Neonflux
neonflux.tripod.com
100+ character sheets for many systems in PDF and TIFF format, plus adventures for D&D and Palladium.
The RPG Character Mortuary
electricferret.com
Final resting place for characters who died - tragically or otherwise - in roleplaying games. Accepts submissions.
Docufluff
night-sky.org
Articles, essays, and game journals on multiple games.
RPGArchive
rpgarchive.com
Archive of adventures categorized by genre and system. Accepts submissions.
The Dragons' Den
geocities.com
Netbooks, adventures, and character graveyards for D&D, West End's Star Wars, and the World of Darkness.
RPG Hoard - downloadable resources
rpghoard.com
Some adventures, fonts, maps, monsters, programs, and other resources for some systems.
The Keep
keep.trawna.com
A large collection of files, mostly related to RPGs: systems, rule supplements, information about or for campaign settings, adventures and ideas for adventures, other GM aids, fiction, humour, and miscellaneous RPG material.