http://www.battlefieldheroes.com
A fun little TF2-esque third person shooter. You get experience and level up and earn money you can use to buy new weapons, and you level up abilities as you gain experience as well. Two factions (Allies and Nazis, although they don't go so far as to SAY that), and you can either be a spy-like thing, a heavy weapons guy, or a standard infantrymen. Has vehicles.