Team Fortress 2, Counter-Strike: Source, Day of Defeat: Source and Half-Life 2: Deathmatch Updates Released
Product Update - Valve
Updates to Team Fortress 2, Counter-Strike: Source, 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 (CS:S, DoD:S, TF2, HL2:DM)
[Windows] Added support for raw mouse input. Raw input reads directly from the mouse, bypassing Windows control panel mouse settings. This addresses issues with high DPI mice, and provides for a more reliable controller experience at various resolutions
[Windows] Improved custom mouse acceleration
[Windows] Updated mouse configuration UI to support raw input and acceleration; added tooltips to some of the options
[Windows] Fixed UI tooltips so that they display correctly on first hover

Team Fortress 2
Added the "Team Spirit" paint can.
Added Telltale Games items:
Dangeresque, Too?: Strong Bad's styling glasses (equipped by the Demoman)
License to Maim: Max's Badge (equipped by all classes)
The Iron Curtain: The Heavy's first love (equipped by the Heavy, obviously)
The Enthusiast's Timepiece: Tycho's favorite timepiece (equipped by the Spy)
Updated some item capabilities:
Employees badges can now have custom names.
The Stickybomb Jumper can now be gift wrapped.
The Spine-Chilling Skull and Voodoo Juju hats are now paintable.
Improved the Spine-Chilling Skull and Voodoo Juju hat positions on the Sniper.
Added the original Ubersaw taunt to the Vita-Saw.
Fixed an issue that prevented the game from running on Fat32 systems.
Fixed a problem with the Sackston Hale achievement sometimes not being awarded correctly.
Fixed the holiday gamestartup sound files being included in the random startup selection after the holiday is over.
Fixed numerous WebAPI issues.
Fixed a Heavy exploit that let him run at full speed while shooting.
Fixed a Frontier Justice exploit that let Engineers have infinite crits for their current life/round.
Fixed the shotgun reload animations for the Soldier/Pyro/Heavy looping endlessly.
Fixed the Medigun charge percent for other players being steppy.
Fixed not being able to light arrows after the first arrow is fired unless they're drawn back.
Updated the localization files