If you havent played TF2 before you can play for free this weekend.
http://www.steampowered.com/goldrush/
Valve has released a major Team Fortress 2 update including the new "Gold Rush" map and "Payload" gameplay style, with new weapons and achievements to earn the new weapons for the medic.
Some of the achievements look achievable, a lot look impossible. :yarr:
Check It Out.
Sounds great, I only wish Valve would support the consoles too, TF2 on the 360 is dead. :(