The changes include:

Half-Life 2: Deathmatch
- Players now play grenade throw animation and RPG fire animation
- Items and weapons punted from their original spawn position now return after x time has passed (sv_hl2mp_weapon_respawn_time, sv_hl2mp_item_respawn_time)
- Improved player crouch animations

Source SDK
- Included support for making HL2DM maps
- Included sample source HL2DM map: dm_lockdown.vmf
- Added xwad, vtf2tga, and glview tools
- Fixed problems running vrad on certain machines
- Fixed bugs adding game configurations with long paths
- Improved detection of bad game paths

Source Engine
- Fixed server plugins not loading under Steam
- Fixed rcon kick failing
- Fixed UDP logging functions not working properly with quoted strings