Beside music,
- Computer science, programing, reading stuff about IT
- Gaming (FPS on PC)
- Reading stuff about science in general
- Girlfriend
I don't know if these count as hobbies, but I run regularly (30 miles a week, ran my first marathon in Feb), play golf when the weather's nice and I have the time (golf lost out to guitar 9 years ago when I got back into it), and I love books, movies, and video games. Going to see live music is almost a hobby within itself as well, I love to see concerts and I'm blessed with an enabling wife.
EDIT: Is being a gear head considered a separate hobby?
Tabletop gamer, like Dungeons & Dragons.
I'm trying to get my wife into watching more concerts as well. I always have the Palladium channel on, in the back ground, Hoping she gets the bug. She's close.
Take wild guess!