Not only did Tor make good on its promise of an Old Man’s War freebie, it also provided the book in HTML and Mobipocket formats, not just PDF (.epub, too, in time?). Nice! Go here for more info on Tor’s free books—intended to hook you on authors, especially those of series.
On OMW itself: I wondered if John Scalzi could pull off the same magic he did in Agent to the Stars. The answer is, Yes. How many sci-fi novels begin, “I did two things on my seventy-fifth birthday. I visited my wife’s grave. Then I joined the army”?