I've probably posted some of these before, but since I came across a couple of good links recently, I decided to post en masse. Here is a list of sites that have huge amounts of links to free games (as opposed to sites with original games, a topic that deserves its own post), some of which are playable online and some of which need to be downloaded and installed. I'll add more links as I find them:

• gnome's lair's freshly hand-picked free games selection
  
• 1up.com's 101 Free Games
  
• Jay Is Games' Best Web Games of 2005
  
• A Complete Waste Of Time
  
• Addicting Games
  
• Games That Don't Suck

Enjoy!