[All GS1.x books now have updated 2.0 code available - contact the authors for support]
Whilst we are happy to answer XNA Game Studio Express questions in these forums, if the question is specifically about the code in a book then it should be directed to the authors specific support channels. This ensure updates of the code sample and future editions of the book as well as directing support to the guys who know the code better than anyone.
Essential XNA Game Studio 2.0 Programming (2.0 edition only) Jim Perry and Allen Sherrod Support: Contact the authors Code download: Wordware page Errata: none currently. The code download page will be used when necessary
XNA 2.0 Game Programming Recipes: A Problem-Solution Approach (2.0 edition only) Riemer Grootjans Support: http://www.riemers.net/Forum/index.php?var=1268&var2=0 Code download: http://www.riemers.net/eng/recipes.php Errata: None