News from theskeen.com:
Resident coder Emu_Kidid has released one fantastic piece of homebrew software. SD-BOOT allows you to boot homebrew and your legal backups using a SD -> GameCube adapter like the SD-Gecko. You can find more information and help test the software and add to the compatibility list by visiting it’s official release thread.

AEP-Emu (DE/EN)
DMG Page (DE)
Indie Retro News (EN)
Retroguru (EN)