Whenever I wanted the user to be able to download a sample file from the book, I just referred to it as being available on "the book's companion website". Problem is, "the book's companion website" isn't easy to find. If you try to find it on cengage.com, you'll hit a dead end.
So, in the interest of being able to refer people to the site, "the book's companion website" is right here. . .
Beginning Game Programming: A GameDev.net Collection (aka The Orange Book)
Advanced Game Programming: A GameDev.net Collection (aka The Green Book)
Design and Content Creation: A GameDev.net Collection (aka The Black Book)
Business and Production: A GameDev.net Collection (aka The Blue Book)
Note that the black and blue books don't have any downloads associated with 'em, but you can still read the official descriptions and author-bios and tables of contents.
I'm still considering registering my own site, ala gamedevcollection.com, although it'd probably be better to pester the gamedev uberlords into letting me have something like gamedev.net/collection or collection.gamedev.net where I can post links to errata (none yet) and discussion topics and deep-links to the code.
Thoughts?