Thanks guys, wonderful answers here. I didn't have to download it on certain days, but the publisher did tell me when it was going to go up as a freebie. Otherwise they didn't offer me a copy. This way it would have come up as a "Amazon Verified Purchase" (and look more authentic I guess).
I'll read it, take some notes, see if I can manage to write a review, and of course mention that the publisher did bring it to my intention.
Scalzi's blog is great by the way
, adding that to my Reading bookmarks.