1 May 2010 Team Fortress 2 Update Released
Updates to Team Fortress 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Team Fortress 2
Added further PropHunt mode support
Added a "SetCustomModelRotates" input, which will enable/disable whether the custom model should rotate yaw (enabled by default)
Added a "SetCustomModelVisibletoSelf" input, which will set whether or not the local player should see his own custom model
Fixed the Engineer being able to build more than 1 of each type of building
Fixed old Engineer build keybinds not working with the new system
Fixed a client crash on shutdown
Fixed the Gunboats not properly applying the damage reduction when Spectators are nearby
Fixed post-processing bug which could cause tone mapping to become stuck at highest setting