Valve has released the first significant update for the PC version of Team Fortress 2 in about a month, making several gameplay tweaks and bug fixes. If it has not already patched itself in your copy of Steam, Team Fortress 2 will update automatically when you attempt to launch it.
Particularly interesting changes include Sudden Death now being a server option that defaults to "off," Spy sapping doing slightly less damage to buildings, and the Medic healing at a faster rate during the pre-round setup time to offset the need for players to self-inflict wounds and boost the heal rate.