I've used Ubuntu for a while, and I've grown quite fond of it. It does the job, and I've even installed Doom3 and some other games on it, which works nicely. Setting up Ubuntu can be hard, but it doesn't have to be. If you have never tried Linux before, I would wait untill the next release in april, which is shaping up to be a lot simpler for first-time users. So if you're wondering if you should try it, then waiting a few months would be the best, in my humble oppinion.