Sonic Retro - Nexus of Sonic research and engineering on the internet.
Wiibrew - The best resource on the web for homebrew apps on the wii.
Polycount - One of the finer resources for 3d/2d digital artwork, specifically for video games.
CodeMii - A Wii programming website run by Teknekal, this is a great place to start wii programming. The beginner's tutorials helped me learn alot.
Sonicfreak94's sepwich A multi-faceted gaming site, there are forums and topics for lots of sadx related things, such as object layouts.
DXX-Rebirth is a source port of the video game Descent, released by Parallax in 1995. The port includes several new features and allows the game to be run on modern PCs