Campaign Builders’ Guild A community dedicated to the art of homebrew.
EnWorld Home of the Ennie Awards, and a wealth of RPG discussion besides.
RPG.net Reviews, columns, and a lively forum for gamemasters, players, and designers alike.
RPG Table Talk The official forums for the RPG Bloggers Alliance.
WotC Forums Half social network, half forums, filled with everything D&D, Magic, RPGA, etc.
Planet Story Games An aggregation of the content from many blogs, journals, and feeds relating to story gaming.
RPG Blog Alliance A community for RPG bloggers and podcasters.
RPG Bloggers Network The best in tabletop RPG blogs.