
I've been toying with it lately, and I'm really impressed with where Linux stands. I've been running Linux as the only OS on my laptop for about two years now, but I've never been able to move to it for my desktop. This is because I know XP like the back of my hand. It does everything I need it to, and most of what I want it to. I know there will be a time when I can no longer use XP, but I'm actually hoping to move before then. One of the biggest barriers I've ran into is that most video games don't work with WINE, but WINE has made great strives in the past few months, and they are working fast to add a lot of support, so it might be less than a year before it is a great alternative to Windows.
I have no plan on learning Vista any more than my job requires. I figure that if I'm going to have to learn something, it might as well be Linux. And I've picked up on a lot having my laptop running Linux for the past few years. I recommend you all take a good look at Linux when you decide XP is not enough for you anymore.
Of course, I wouldn't object to finding a third party version of XP lying around, since I'm still using good ol' Windows ME.