The Amazing Rolo (and by this effort I think we can probably say that he really is amazing) has used a Wii controller and a Mac to create an amazing system to create and manipulate music loops.
More details can be found on his website.
We had something similar to this in one of the rooms in the CS lab at uni but it was about how to steal the coffee table from the room. This is much better.
http://www.flickr.com/photos/jurvetson/21470089/
About 6 months ago I screwed up my system trying to get XGL+Compiz to work. Now, seeing as uni is over for the year so I don’t have to worry about stuffing it up again I thought I’d try again. I stumbled upon Beryl. Seeing as I use KDE I really didn’t want to emerge half of gnome to get gconf happening so it worked out ideally. The only downside is that I’ve been seeing the window flicker bug a bit but it’s relatively easy to fix and I don’t restart willy-nilly anyway. Not bad for bleeding edge software.