Emu_Kidid has released a new version of his sd-boot homebrew application. Using this application along with an SD->GC adapter you can boot .GCM files from your SD card using either your Nintendo GameCube or Nintendo Wii.
What's New?
* Compatibility Increased greatly (possibly a slight loss of stability though)
* Recoded the SD card reads (patch codes)
* Fixed file browser
* Fixed the issue of sector finding
* Fixed build process