I just got my link to read John Scalzi's OLD MAN'S WAR (a book I shopping carted at amazon, but never actually purchased).
The next book they'll be letting us read is SPIN. (Got it a while back. Read it. Reviewed it here and at amazon. Faboolicious.)
If you haven't signed up for it, and you want the links for the free Tor e-books, goeth here:
Watch the Skies!