Updates to Team Fortress 2, Day of Defeat: Source and Half-Life 2: Deathmatch have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
Source Engine Changes (TF2, DoD:S, HL2:DM)

• Fixed a problem that allowed malicious clients to disable the "ping" and "status" commands for other connected clients

Team Fortress 2

• Added The Toss-Proof Towel
• Fixed a bug that caused many avatar images to not show up in the scoreboard
• Fixed the Sharpened Volcano Fragment not igniting players
• Fixed damage to buildings applying on-hit effects such as the Übersaw charge
• Fixed Sticky Jumper stickybombs changing team when air-blasted
• Fixed large floating point values getting truncated in WebAPI responses
• sǝlıℲ uoıʇɐʇɐzılɐɔo˥ pǝʇɐpd∩
• Community request
  • Added SetForcedTauntCam player input for map makers to place the player into third-person