Hey! Thanks to John (at Grasping for the Wind) pointing this out, I just received a free book from Tor in my email today! Spin by Robert Anton Wilson. I've read a few of this author's earlier works and enjoyed them, so I'm doubly stoked!
Of course, as I noted yesterday, I have a shipload of books heading my way, so suddenly I'll be sitting on an embarrassment of riches, reading-wise. But how can you say no to a free eBook? (downloadable in 3 different formats, including HTML).