Budding musicians?

I use it with an M-Audio Radium midi controller and have Jampack 2 installed. On occasion, I'll also plug my guitar in. I also have a few artists' albums in multi-track format (God bless their souls) for remixing. It's a blast to use and I really enjoy the creative process (although I don't think I'm ready to quit my day job just yet!).
Any other GB users/tinkerers here?