Steam is known for having great weekend deals. This week it is the Greatest Indie Pack for $10 (75% off). The Greatest Indie Pack includes:
Together, for $10, is a great deal on these games. Eets is a great puzzle game (also available for the xbox 360), and Multiwinia is a multiplayer version of Darwinia. Trials 2 is a very frustrating (but fun) 2d motorcycle game involving the arrow keys and physics-based stunts.