Brian A. -- who improved his odds by purchasing a couple copies of T-Minus -- had his number come up in the drawing, so he gets the book. Congratulations Brian, and thanks to all who entered. As I knew would happen, almost everybody had something interesting to say beyond just "sign me up," so I enjoyed hearing from you all!
[In case you missed my comment at the close of the drawing, here's how I picked: I listed out the entries as they came in and assigned numbers to each one. For example, if Buzz Aldrin had been the first to respond, with just a comment or email, and Sally Ride was second and she reminded me she bought three books last year, and Alexei Leonov responded third and showed me he had purchased a copy of T-Minus that day, and then I got another entry via the blog, the list would have looked like this:
[In case you missed my comment at the close of the drawing, here's how I picked: I listed out the entries as they came in and assigned numbers to each one. For example, if Buzz Aldrin had been the first to respond, with just a comment or email, and Sally Ride was second and she reminded me she bought three books last year, and Alexei Leonov responded third and showed me he had purchased a copy of T-Minus that day, and then I got another entry via the blog, the list would have looked like this:
1 Buzz Aldrin
2-4 Sally Ride
5-17 Alexei Leonov
18 Alan Bean
and so on. Then I went to www.random.org and put in the total number of entries (18 in the example above) and it spit back a number at me (11 for this test case, so congratulations to Alexei Leonov), and then I contacted the person who got the book!]
Again, thanks to everyone who entered. When I find something else cool to give away, I'll do this again.