Troll Lord
C&C products/downloads. Castle Zagyg. Gygax's Fantasy Worlds line. Forums.
Dragonsfoot
AD&D, Classic D&D, C&C, Lejendary Adventure, Hackmaster, Savage Worlds. Free adventures. Articles. Character Sheets. Forums.
CnCPlayer.net
A clearinghouse of C&C links.
Knights & Knaves Alehouse
(OSRIC/AD&D/OD&D stuff, forums)
Old-school support. OSRIC, AD&D, OD&D, Holmes.
Pied Piper Publishing
Rob Kuntz adventures for 1E. Forums.
Lejendary.com
Lejendary Adventure material. Articles. Character Sheets. Errata. Forums. Etc.
Goodman Games
Good adventures with an old-school approach. Mostly 3E, but also C&C (e.g.
Mysterious Tower,
Palace of Shadows) and 1E (
Iron Crypt of the Heretics). And Judges Guild (
Thieves of Fortress Badabaskor). Forums.
Necromancer Games
Good adventures with an old-school approach (e.g.
Rappan Athuk,
Demons & Devils,
Tomb of Abysthor,
Lost City of Barakus,
Necropolis, etc). Unlike Goodman, it's 3E only, but usually easy to convert to C&C. Forums.
Basic Fantasy
The Basic Fantasy Role Playing Game. Free. Excellent. Very similar to and mostly compatible with B/X (and thus usable with C&C, 1E, etc). Free adventures.
Robert Fisher's Classic D&D Page
Short articles and essays about Classic D&D.
Paizo
PDFs of old TSR material. Single-issues of
Dungeon that I want (like the ones with Maure Castle installments).
Chaosium
Call of Cthulhu products, character sheets, adventures, et cetera.
Yog-Sothoth.com
Call of Cthulhu support. News. Product database. Articles. Downloads. Forums.
Board Game Geek
Board game database. Ratings, reviews, downloads, et cetera.
DragonBalls
Because the banner graphic makes me laugh.
Sites I used to visit frequently, but don't get around to as much these days include: Malhavoc Press, Green Ronin, True20, Mutants & Masterminds, and
Codicil.