For free games, some games made on Flash are terrific time killers. Some of them are popular, but others hide in obscurity. Here are some awesome flash games you may have never played:

• Skears DX: http://newgrounds.com/portal/view/93858
  
• Hagy Game: http://newgrounds.com/portal/view/153639
  
• Turbo Spirit: http://www.neodelight.com/turbospirit/ (Make sure you check out the rest at Neo Delight)
• Uninvited: http://albinoblacksheep.com/flash/uninvited.php (It's pretty funny)
• Tontie V1: http://www.eyezmaze.com/tontie/v1/index.html (The one on eBaums is obsolete)
• Not Pron: http://deathball.net/notpron/ (Not a Flash game, actually, but worth mentioning due to its mindboggling difficulty)
  
• Flash Flash Revolution: http://www.flashflashrevolution.com (try the original and R2 Beta)

When you get bored of those, try WarioWare on the Gamecube, because that's pretty much the equivilent of playing the craziest flash game in the Universe. If you have a GameCube and never tried it, what are you waiting for? It's been on rental shevles for months and is budget priced.

Happy gaming!