Updates.
So, I've noticed increased productivity in some of the work I'm supposed to be doing. Why's this? Because Ubuntu Linux makes computing an utter delight. I'm ecstatic to open, close, and drag windows just to see their translucency and 3D effects. I love rebooting for the sounds, splash screen, and command lines in GRUB. I love every aspect of my new operating system, and I haven't yet found something I can't do on XP. CS3, sure, but I have Wine. :P
Amazing.
(I also LOVE the apt-get function.)