GCEmu is GameCube emulator for Windows. It has been in development for about one year and it's capable of running commercial games.
Here is what one of the authors has to say about this release:
"GCEmu is a very incomplete emulator for the Nintendo Gamecube.
It uses recompilation techniques and some other tricks to achieve a reasonable speed. Although emulation is very incomplete, this emulation shows that 'it can be done' and can be done at a decent speed.
Where Dolphin Emu shows that the emulation can be done, GCEmu shows that it can be done at speed. This is because the different focus. Where the Dolphin guys hate to do cpu emulation (especially recompilers) this is exactly what I (Tratax) have been playing with since PSEmu. It was made using Visual Studio C++ using pure C code and a few bits of assembler."