I'm just starting the book and was frustrated by the fact that it says to create a "Windows Game" project (p.15) and then "switch to the Xbox 360 output" (p.26) when you want to deploy the project to the 360. I looked and looked for a way to make this switch, then did some googling, and apparently, this is not actually supported. I did find a guy who provides project templates that support both Windows and 360 here: http://xna.tiddlyspot.com/#%5B%5BBui...0project%5D%5D
If the ability to switch the output of a "Windows Game" project to 360 is something that was previously available but has been removed, I think this would be a good topic for the Errata.
Anyway, I thought I share this in case anyone else hits the same frustration.