I'm working on writing a homebrew app/game for karaoke: the purpose is to be able to have the PS3 behave like a karaoke machine with some interactive features. you'll be able to use your own videos on an USB drive and for lyrics you can use subtitle-like files (in case you want to use original videos, not those with embedded lyrics). it works with USB microphones and it should also work with bluetooth headsets or similar input devices. for the gaming part, I'm planning on identifying notes and matching with the audio stream embedded in the video. anybody interested in this sort of entertainment?