from Eke-Eke:

GnuboyGX is a port for the Nintendo Gamecube and Nintendo Wii (running in GC mode)
of the open-source Gnuboy emulator, originally coded by Laguna and Gilgamesh.
More infos about Gnuboy here: http://en.wikipedia.org/wiki/Gnuboy

This port is based on the last 1.0.4 CVS source, released by Joshua_ from EFNet #gameboy
http://www.netaxs.com/~gevaryah/gnuboy-1.0.4pre.tar.bz2.

Don't forget to read included gnuboy.txt for more detailled indications.

-=[ FEATURES ]=-

. Gameboy and Gameboy Color emulation with sound
. DVD & SDCARD support for rom loading
. Freeze State support (load & save)
. SRAM/RTC support (load & save)
. support for 8MB roms
. support for zipped (.zip) roms
. support for alternate Mono Gameboy palettes
. RTC synchro
. Load/Save SRAM and FreezeState files (compressed) from/to Memory Card & SDCARD
. SDLOAD or IPL reboot option
. Wiimote/Nunchuk/Classic controller support (Wii version only)
. Automatic SRAM/FreezeState
. Video mode supported: 480i,480p & 576i (automatic detection)

Changelog:
[NGC/Wii]
- removed embedded font, (re)enabled IPL font support: now should works for Qoob users too (thanks to emukiddid)
- patched libfat for faster SDCARD accesses (thanks to svpe)
- various bugfixes, menu tweaks and code cleanup

[NGC only]
- added 480p support in menu

[Wii only]
- implemented fast scrolling in menu using Wiimote D-PAD
- added "Power" button support
- added USB Storage support
- Widescreen menu fix
- *new* libogc 1.7.0 features: SDHC support, Wiimote shutdown button support