Hacking the Xbox: An Introduction to Reverse Engineering by Andrew "bunnie" Huang is now available as a free eBook download. Andrew Huang was the first to hack the original Xbox and published the book in 2003.
"No Starch Press and I have decided to release this free ebook version of Hacking the Xbox in honor of Aaron Swartz. As you read this book, I hope that you’ll be reminded of how important freedom is to the hacking community and that you’ll be inclined to support the causes that Aaron believed in." -bunnie
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Download Hacking the Xbox: An Introduction to Reverse Engineering