I read somewhere that Wii Motion Plus drivers are in the works for Wii homebrew, or that they will be. I don't remember which.
Also, I finished MP2 a few days ago, and started on MP1. (Yes, I'm playing Metroid Prime out of order. It was an accident that I didn't feel like fixing because it seemed like a better idea to just finish MP2 first when I finally got MP1.) If, for some awkward reason, one of you haven't played it yet, do so. It's worth it.
It's interesting that you got Guitar Hero 4 for PC, E. Was it worth it over console versions?