First of all, Merry Christmas to all of you so inclined to celebrate today! My 5yo has opened all his presents and is presently taking them for a joyride while I sneak away for a few quality moments with my laptop.
Second, as usual, Rainbow Ebooks has awesome discounts on Tuesday. They are offering 30% off holiday titles and 20% off a bunch of other stuff, including Inertia and Acceleration. Happy Holidays!