Dan Waters who is the new Microsoft Academics Relations Manager for the Gulf States has a nice blog entry on creating your first XNA game that I plan on using with my high school programming students. Dan walks you through in his tutorial on how to create his version of a pong game. He does a good job explaining the code and how he used collision detection with his sprites as well.
What I liked was a nice powerpoint presentation that you get when you download the source. Dan spent some time creating notes for each slide which will be helpful for new teachers who want to teach XNA with their students this year.
Finally, Dan does a great job commenting in his code and it's a great example to show students why comments are important as programmers. I look forward to meeting Dan in the near future and hopefully he will find the time to speak to my students.