My absolute favorite time wasting site has to be the Experimental Gameplay Project, a site featuring a few hundred free and insanely inventive (often twisted) games. There’s the Tower of Goo, a Global Warming shooter, and Super Tummy Bubble!, just to summarize a few of my favorites. The site, started in 2005 by the Entertainment Technology Center at Carnegie Mellon University, requires contributed games be created by only one person in less than seven days with a common theme like gravity or swarms. Each game is usually a single .exe file or a small .zip. No installation needed. So download to your pleasure and enjoy.