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)

• Added ConVars sv_rcon_maxpacketsize and sv_rcon_maxpacketbans to allow server admins to control the maximum RCON packet size and whether or not users get banned for exceeding that limit. The defaults reflect the existing behavior.
• Fixed not being able to import custom spray images on Macs
• Fixed Macs cancelling http map downloads that take longer than 30 seconds

Team Fortress 2

• Added Pyrovision!
• Added new game mode Special Delivery and map Doomsday!
• Friendly players glow when carrying the flag
• Fixed rare cases where flag could fall out of the world
• Fixed cases where the Payload HUD looked like the cart is still on a hill when it isn't
• Fixed cases where some clients didn't receive broadcasts about long continuous particle effects being started or stopped
• Updated the HTML renderer for displaying server MOTD
• Votes created by a dedicated server no longer trigger a failed vote cooldown
• Fixed map triggered annotation events not working on dedicated servers
• Fixed the game crashing if tempents are created that use invalid materials
• Using a Name Tag while in game notifies everyone of the name change
• Fixed Strange Part: Projectiles Reflected not tracking grenade and sentry rocket deflections
• Added new items
  • City on Fire item sets
  • Pyroland weapons and cosmetics
  • Community-contributed cosmetic items for all classes
  • Mysterious treasures have been incinerated, but are now craftable
  • Added crafting recipe for Pile of Ash
  • Scorched Keys are now available in the store for a limited time
  • New promo item
• Weapon balancing changes
  • Gloves of Running Urgently
    • Removed self-damage over time penalty
    • Heavy takes mini-crits while active and for 3 seconds after switching away
    • Attack damage penalty reduced from -50% to -25%
  • Tomislav
    • Spin-up speed bonus reduced from +40% to +10%
  • Quick-Fix
    • Medic mirrors blast jump of their heal target
  • Crusader's Crossbow
    • Reload speed time reduced by +40%
  • Cozy Camper
    • Regenerates 1 heath per second
    • Reduced movement penalty from -90% to -80%
  • Sticky Jumper and Rocket Jumper
    • Added 'flying' sound to blast jumps
  • The Concheror
    • Changed rage building source from "damage done and damage received" to only "damage done"
    • Increased the rate at which Rage builds for this item by +25%
  • The Equalizer
    • Removed player move speed modification and added it to a new item named The Escape Plan
    • All owners of the Equalizer will be automatically granted The Escape Plan
  • Crit-a-Cola
    • Added +25% increased movement speed while active
    • Increased duration from 6 to 8 seconds
  • Atomic Bonk
    • Increased duration from 6 to 8 seconds
  • All Flamethrowers
    • Increased base damage by +10%.
  • Backburner
    • Removed +10% damage bonus attribute
    • Note: Because of base damage increase, damage remains unchanged
  • Degreaser
    • Added -10% damage penalty attribute
    • Note: Because of base damage increase, damage remains unchanged
  • Phlogistinator
    • Damage defense while taunting reduced from -90% to -75%
• Item bug fixes
  • Fixed sentry sometimes spawning in shielded mode while the Wrangler was equipped, but not deployed
  • Improved visual and audio cues for when the Manmelter is ready to fire
  • Fixed Manmelter being able to earn crits via friendly Pyro self-damage
  • Fixed Scotch Bonnet's blue team skin not showing
  • Fixed Unarmed Combat's taunt not working
  • Unarmed Combat's color now matches the team using it
  • Fixed the Apparition's Aspect showing a burning texture in DX8