I worked on my first XP project with John Boal. He recently did a post on ScrumBut. I have mentioned ScrumBut and Scrummerfall before, but this is a good, quick read with a few good tips. A lot of the concepts carry over to XP as well.
I'll add something though: Make sure your stories have acceptance criteria defined before you start working on them. This way you know when you are done. 🙂