My main hobby right now is my kids.
Beyond that and r/c, I collect automotive magazines. I've got about 15~17 years worth of Road&Track, Car&Driver, and MotorTrend. It drives my wife crazy that I've got so many magazines lying around. And a few years ago, I added RC Car Action and RC Driver subcriptions to the pile.
I also enjoy my home audio/video equipment. I've got a 50" Samsung 1080p DLP television, an Onkyo 604 receiver, a Hsu STF-2 sub, and Hsu Ventriloquist speakers. I wanted bigger speakers, of course, but my wife vetoed me.
I love the name of the sub. Reminds me of STFU!!!!
http://www.hsuresearch.com/products/stf-2.html