Hundreds of online games. These games are in the old school arcade style - simple but addictively fun to play. There are quiet a few there so you can really kill some time trying them out.
This is a high-quality 3D flight simulation game dedicated to World War II military aviation, where you play it's online against other real, non-bot players. The game is free to download and play, but as you would expect you need to pay for premium content and in order to advance quickly.
With Football Superstars you get a complete Virtual Football World. In this vast virtual world you command your own character, and play football with and against other live online players.
Free collection of online games - sports, action & adventure, puzzles, shoot 'em up and kids. There are games for if you want to play solo or with a friend. Most are in flash, shockwave and java formats.
Free realtime massively multiplayer online space game. This browser-based space game doesn't require any downloads. It is free but in order to get the best upgrades and ships you will need to pay.
This site has a load of free online games. You will need to register before you are able to access them though. There are also some games that you can download.
Like fantasy football for movies, this site lets you create your own fantasy movie studio with a slate of real-life movies. As those movies perform well in the real world, so does your fantasy studio.
As the name suggests this site contains a bunch of, wait-for-it... Flash Games! You can play arcade, action, sports, puzzle, card and other types of flash games.
This site contains a long list of online games. These are divided into Java games, Flash games and Shockwave games. Obviously you will need the relevant browser plugins to play.
ROBLOX lets you build your own game world which you can publish and share with others. It's similar in concept and style to Minecraft but does offer quite a few features which sets the game apart. One of the main differences is that it's free to sign up and play ROBLOX.