Check out this
post from The Unofficial Apple Weblog
(TUAW):

Filed under: Software, Stocking Stuffers

Almost a dozen companies are offering a 20% off sale until Christmas.
Rogue Amoeba, Bare Bones, Potion Factory, Unsanity and more. You’ll
find a full list of participating developers at the MacSanta site.

(from: MacSanta:
20% off popular Mac Apps)

For all you mac users out there 🙂