Here are a couple of free game downloads you might enjoy:
Sudoku Portable is the Sudoku puzzle game as a portable app, so you can play on the go. You can place it on your USB flash drive, iPod, portable hard drive or a CD and use it on any computer, without leaving any personal information behind. Download from SourceForge
Texas Hold-Em Poker
This is a poker game with computer-generated opponents as well as network play against opponents all over the world.
Download from SourceForge