Independently developed games can have some of the most innovative game playing techniques. I always enjoy a high quality shooter, or in depth RPG, but nothing beats playing something with a little freshness to it. Mightier delivers with some good playability. Part platform puzzle game, part pen and paper, and totally free.
Don't be a software pirate this holiday season. Get yourself OpenOffice.org and save yourself $400. In addition to not breaking the law, it is way better than the Microsoft Office suite.