I've put my first XNA file on VerySillyGames. It is just a silly screen display. The source code will be provided when the book is released. It is a nice example of how you can get really good graphical effects almost by mistake. You can find a runnable version of the program for the PC at www.verysillygames.com. It is optimised for 1280 x 1024 displays on a PC with the XNA framework installed. An Xbox version will be available later.
If you are lucky enough to be a student at Hull you can join the VerySillyGames.com development effort, where we are going to take some of the silly game ideas and try to make them real. This time next year we'll all be millionaires. Oh yes.