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 wont 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_prefix
-de_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