Team Fortress 2 remains as enduringly popular as ever. Here's a whole heap of trailers for Valve's shooter. If you're not already playing, have a look at these 'Meet the Team' trailers (each introduces a different class), and then get downloading.
Meet the Pyro
Meet the Scout
Meet the Sniper
Meet the Demoman
Meet the Engineer
Meet the Medic
Meet the Soldier
Meet the Heavy