[10] high

taken from steam's website:

Updates to Call of Duty: Black Ops have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Call of Duty: Black Ops

Improved threading performance on computers with only 2 cores.
Additional performance optimizations
Added an option to pre-cache all shaders during load time. This fixes hitching related to shader compiling on some video cards when viewing an area of the map for the first time.
Fixed random freezes in certain computer configurations.
Allow Team Change on Ranked servers when it does not unbalance teams (this is a server admin option).
Allow Team Change grace period at start of match (server admin option).
Added 4 more reserved slots (server admin option)
Added /connect
Improved quickmatch results (server side change)
Fix for watching films through Combat Record
Fixed compassSpectatorsSeeEnemies exploit
Fixed 3rd person fov exploit
Fix for infinite supply drop exploit.
Fixed crosshair flickering when stereo is active.
Various spawn improvements
Various sound improvements
Fix for Zombies – Teammate shadows not displayed properly.
Fix for radar not staying on in One in the Chamber when it should.
In a Domination match, the Position Secured medal is no longer delayed.
'Hardened: Equipment Shot' Challenge can now be completed by destroying a 'Camera Spike'.
Fix for choppy final killcam in dedicated servers.
Various map glitches fixed.
Weekly and Monthly leaderboards will now track all kills, deaths and assists properly (All Time leaderboards were not affected by this)
Added mixed hardcore playlist
Added mixed barebones playlist
Added 12 player versions of all playlists

Rcon

Reduced timeout values. Connect (or failure to connect is faster).
Added all white-listed dvars for Ranked and Unranked. Admins have rcon access to ALL available dvars.
Added Settings and Console tabs for Ranked servers.
Fixes a bug where the “Server” tab doesn’t update values when connecting to a new server.
Added version number to the title bar.
Fixed a bug where UI state didn’t persist after switching to another server.
Added “disconnect” button.
Fixed map “set” to not use admindvar.
Changed all dvars which could be possibly float, to float. Mostly these are time-type dvars.
Fixed bug where entering a value of zero for Message Duration would cause a unhandled exception error
Truncated all message fields to 140 chars