For one thing, n64iphone, the emulator in the video the OP mentioned, has been demonstrated working and 0.7.0 has been available for a couple of days. The hand-synced video of 3G4 was obviously fake, was supposed to be available to "beta testers" (AKA victims of spam/who knows what) in the spring, was "developed" by a 14-year old who has absolutely no emulation credibility, and has acted like a complete... well... 14 year old when he was told 3G4 was fake. The second thing is Mupen64Plus recently got an ARM dynamic recompiler from Ari64 of OpenPandora fame, and is running almost full speed on the Pandora - N64iphone is also based on this port. I've compiled and run it with almost no modifications on my iPAQ running Debian (which is much slower since it doesn't have OpenGL/ES). It should be a simple compile for the N900 as well.