I had a Gyration Air mouse thingy that was fantastic, always worked OOTB, with F6, F7 and F8 button mappings. Unfortunately it got nicked and I never replaced it, and have been using a mobile orbiter ever since, which I also think is great. I suppose part of the reason I never replaced the mouse is because the wii remote will eventually be able to do the same thing.
Cheers,
Matt.