We have a winner of Jack Hagerty's Spaceship Handbook! Using a random number generator (I told it to go from 2 to 570; my post was first, and 570 was the last post in the thread before the deadline) and it spat out post 97, which belonged to khab_rmb. I sent an email and got a prompt response, and the book will be winging its way to her soon.
If you didn't win, don't fret! You still get a 15% discount if you want to buy the book. And, of course, there will be more giveaways soon.