Half Life 2 Death Match has been released [2] over Steam.

A Half-Life 2 update has been released via Steam. Please restart Steam to apply the update.
Included in this update:
Half-Life 2: Deathmatch
* New multiplayer game featuring physics simulation system

Half-Life 2/Source SDK
* Includes game code needed to create Half-Life 2/Source MODs
* Ability to edit Half-Life 2 maps
* Maya model exporter
* 3d Studio Max model exporter source code
* Sample MOD with vehicles

Source Updates
* HTTP and non-HTTP map auto downloading functionality * Enhanced dedicated server logging capabilities * Various tweaks and fixes

*Also: A Half-Life 2: Deathmatch Map Making Contest has been announced. The winning entry will receive a cash prize of $5,000. Two runner up entries will receive a cash prize of $3,000.