Dungeons & Dragons Wiki is a new D&D 3E and 4E homebrew content site. Dungeons & Dragons Wiki aims to compete with existing sites such as D&D Wiki by holding to a mantra of “quality, not quantity”. It’ll be interesting to see how this turns out. Both sites have large amounts of homebrew material, especially useful if you’re looking for a supply of 3E content.
Dungeon Mastering Tools from popular RPG blog Dungeon Mastering now offers 384 monsters for D&D 4th edition, 43 magic weapons, 12 traps and 4 power cards, plus tools to write your own statblocks.
Also, if you missed it the first time, I linked more D&D resources in March of this year.