If you haven't downloaded the v1 release of XNA Game Studio Express yet then this contest may be an incentive. There is just a teaser there now because the contest doesn't open until January. But you or maybe some of your advanced students who are looking for a way to show off their mad game development skills may want to get the software now and start playing with it.
There is information about some XNA tutorials here BTW.
PS: It looks like Tom Indelicato, a friend of mine and an outstanding high school computer science teacher, is looking at using XNA GSE for projects in his Advanced Placement Computer Science class for after the exam.
Can you get us any date related info. This might work great from the projects my 2nd years students will start in January as we have just finished C#.
I will try to find out when the contest opens and as soon as I know I will post it here.
Bill Reiss has some good tutorials on his site using the latest version of XNA. http://xna101.spaces.live.com/blog/cns!77EE4BD533D8ECAE!125.entry?_c=BlogPart
Be careful when looking at XNA tutorials because if they were made with the earlier version of XNA it will not work with the current XNA version.
This contest may be an incentive to look at XNA Game Studio Express . There is just a teaser there now