Tor has restarted their free e-book program with two free e-books this month and they promise to follow it with an additional e-book each month following. From an email I received and as reported by carandol in the Deals, Freebies and Resources forum
, there is a catch to the free e-books -- you must register for their SciFi & Fantasy blog.
The first e-books offered are Dogland
by Will Shetterly and The War of the Oaks
by Emma Bull.