Producers Page
at rpgunited.com -- A comprehensive directory of major RPG producers'
websites.
Dungeons and Dragons Adventures
-- a great resource with downloadable adventures, magic items, creatures,
classes, articles, and more stuff for DMs.
Planet ADnD -- More excellent
resources for your D&D game.
Monte Cook.com -- Website of game
designer Monte Cook (writer of Arcana Unearthed)
Wizards of the Coast -- these folks
created some games...D&D, Magic: The Gathering, Axis and Allies...maybe
you've heard of them?
White Wolf Publishing -- Creators
of the World of Darkness, and a host of games with colons in the title.
Steve Jackson Games -- Publishers
of GURPS, In Nomine, Munchkin, and Toon; fans of all things Illuminati.