From Tor's sparkly new site:
"...for some months now, Tor.com has been making free, un-DRMed electronic editions of particular Tor titles, one per week, available to people who register at the page which has been temporarily holding down the tor.com URL. At any rate, now that the life of our doughty little holding page is drawing to a close (shed a tear), we thought we'd make everything we gave away there--all the novels, all of the desktop wallpaper--available for one additional week, starting today and running through Sunday, July 27."
The full list is here and looks pretty tempting - included are Tobias Buckell's Crystal Rain, John Scalzi's Old Man War and many, many more. If only I had some kind of electronic reading device to hand!