Update: a few hours after release, a bug causing crashes with Windows x64 and Single Core mode was found by testers. Single Core mode is not used for regular gameplay but is usually required for TAS and NetPlay. While it only affects a few specific use cases of the emulator, we still consider this a critical issue and we will release a Dolphin 4.0.1 version fixing this bug. Sorry for the inconvenience.
On behalf of the Dolphin Emulator development team, I am pleased to announce the release of Dolphin 4.0, the newest major release of the most compatible and most performant GameCube and Wii emulator for PC. Dolphin 4.0 is a special release for all of us, since it also marks the 10 years anniversary of the project, first unveiled by Henrik Rydgård (ector) and F|RES in September 2003.
Dolphin 4.0 can be downloaded for Windows (x86 or x64), Mac OS X (>= 10.7) or Ubuntu 13.04 from our official website: dolphin-emu.org.