I'm going to be giving a guest lecture at the University of Wales, Newport this Friday afternoon, just before the Global Game Jam! Topics to be covered will include the basics of PHP and MySQL, getting XNA to play nicely with a web server, and building a basic global high-score system, with practical work setting up your own high-score server in one afternoon. Why not incorporate global high-scores into your GGJ entry this year?
If you're a Newport games student, come along and listen to my network-based ramblings! If you can't come along and if there's enough interest, I'll also put up an abridged version as a tutorial on davecheesefish Games sometime in the next couple of weeks.