Google "Ubuuntu"... there is a lightweight variant of that, which will be good for an older system, and it has a robust community of people that work on it. It's tremendously popular.
Related to Ubuuntu, but a little more "polished" in my opinion, is Linux Mint. Click
this link, and look at the XFCE version. It is very lightweight on system resources, and you should see a notable improvement over XP.
I'm not a Linux geek, but I do play around with some of the distributions a little bit. If you have any technical questions, I'm afraid I can't be of much help, but I can tell you that Linux Mint is typically pretty straightforward and easy to work with.
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