Sony Infantry Online game: Very addictive online game, you have to register and you can play as a guest for 1 hour at a time (as many times as you want) but after 1 hour you get kicked out and have to start over again (you lose your $ and weapons). If you really like the game you can pay $7 a month and you don't get specced every hour.
Great Co-op gameplay with online players from all over the world. CTF, FFA, etc. Very customizeable weapons & armor setup, lots of classes: Heavy Weapons, Infantry, Infiltrator, Psiops, Medic, Etc.