Work pretty much consumes almost all of my time, but I do enjoy:
High end hifi/av gear. Currently, I try to sneak in time to watch HD content on my 720p HDTV projector with a 8 feet screen.
Outdoors stuff (hiking, biking,etc),though I REALLY don't have time for it.
Video games (I have even LESS time for this). I buy a game occasionally, but they end up just laying there unopened.
Exploring stuff. I'm a nyc native, and moved here only recently. Just driving around and seeing where I end up is sometimes satisfying.
Keeping up with tech/business/finance. The tech part not so much a voluntary hobby as more of a requirement of the career.
Toys (especially Lego). But again, no time.