Heres a Beta Release of a Nintendo Gamecube & Wii Emulator for Windows, heres the release notes:

Dolphin Git 5.0-6471 is compiled. This is the trunk of Dolphin Project. Dolphin is the first Gamecube emulator able to run commercial games! Dolphin is a Gamecube, Wii and Triforce (the arcade machine based on the Gamecube) emulator which supports many extra features and abilities not present on the original consoles. It has a partial Wii support and plays most Gamecube games.

Dolphin Git changelog:
* Merge pull request #6433 from hrydgard/optimize-uninitialize-xfb-memory
* SSE-optimize UninitializeXFBMemory
* Merge pull request #6428 from JosJuice/qt-zh-order
* Qt2 translation: Don't place "zh_CN" and "zh_TW" after "zh"

more info