Check out http://www.emulatemii.com for the latest news on the progress of this emulator, featuring regular updates and in-depth technical posts on the progress and current features. If you like this emulator, please [http://emulatemii.com/wordpress/?page_id=66 donate] and support the team!
There is an "experimental modification" of Wii64 called "Not64" in [http://www.emulatemii.com/wordpress?p=450 one of their blog posts]. It is really a modified version of the "Beta 1.1 'Honey'" version. This version has several fixes and additions. If you want this unofficial version of the emulator, check out this [http://www.gc-forever.com/forums/viewtopic.php?f=9&t=842 GC Forever forum thread].