Counter-Strike: Source
-New hostage rescue map cs_compound
-Added Source version of de_train
-Upgraded version of the CT player model
-Location names are shown in radio/team chat, and under the radar
-Server tickrate can be specified with -tickrate
-Added radio command aliases
-Added mp_humanteam cvar [any | ct | t] (forces human players onto specified team - useful for humans vs bots)
-Added new "match" mode for bot_quota -- If bot_quota_mode = "match", bot count = (human count) * bot_quota
-Bots no longer automatically follow humans (bot_auto_follow now defaults to 0)
-Bots are balanced before humans with mp_autoteambalance
-Bots can open simple +use doors
-Bots change their names to match the prefix when bot_prefix changes
-Several improvements to bot behavior when paths become blocked -- solves problems specific to cs_havana
-Bots won't throw grenades if something is blocking their throw
-Bots are better at only breaking objects that are in their way
-Fixed bug where a bot occasionally "dithered" rapidly between two or more targets without firing bot_kick and bot_kill console commands use the bot's base name without the bot_prefixde_piranesi - bots avoid the breakable crates better.
- A bomb exploding just as the round restarts no longer kills players at the start of the next round
- Grenades being thrown when the player dies no longer disappear
- Increased mp_limitteams bounds to 0-30, where 0 will disable this functionality
- Players' arms and hands can be hit by bullets now
- Target ID font is proportional, and it doesn't resize incorrectly after a resolution change
- Overviews don't show player locations when mp_fadetoblack is on
- Players with spaces in their names can be selected in the spectator GUI
- Observers can change their name at round restart
- Throwing a grenade right at round restart no longer results in holding a "ghost" grenade viewmodel at respawn

Source Engine
- Fixed a bug where snd_mixahead was not working properly. Should fix some sound popping problems for certain sound hardware when running at a low framerate
- Added support for a new surround sound buffering technique that streams six discrete channels instead of using DirectSound3D. Use snd_digital_surround in the console to enable this. This allows for support of Dolby Digital 5.1 on nForce2 hardware
- Allow mp3 playback at rates other than 44100Hz. This was requested by the MOD community

 Master Server Query Protocol
- Added a challenge number to A2S_PLAYER and A2S_RULES server queries
* setting "sv_enableoldqueries" to 1 (default) allows old style (no challenge/response) queries to work. By default queries don't require a challenge number for clients on the same B class network, change "sv_allowlocalquery" to 0 to disable this functionality
- Changed A2S_INFO server query to require the string "Source Engine Query" appended to the end of the query packet.

Half_life 2: Deathmatch
- Fixed model exploit that would allow players to select an invalid player model
- Added weapon type to server log