I've never contracted, but I'm in the exact same boat with regards to being someone else's full-time employee. Lately I've been struggling to stay even one year—I've been with 4 companies over the past 4 years! I'm a "flight risk". :)

And it's not that I don't want to work. I put 3-4 hours per weeknight into side projects, and another 8-12 hours on weekends. I have yet to make money on the side, but I keep hoping that something will succeed and I can run my own ship.