I backed for two copies. One for me, and one for my older brothers that I plan on giving them as a Christmas gift. I pretty much got into gaming via their Sega consoles, particularly the Genesis, as a kid, and I know they are both still fond of those classic games (even if one of them doesn't game much anymore), so I feel it's appropriate.
If anyone's looking for a chance to win a copy, I'm raffling one off over at www.extra-life.org/participant/sewart
I personally can't wait for my copy. I had a chance to read some of the material that will be included in the book. It's going to be amazing.