Valve has released updates to the Source Multiplayer games, including CS: Source. The updates greatly improved the voice quality of the in-game voice communication, as well as modifying the text chat functionality. The updates will be applied automatically when your Steam client is restarted. The specific changes include:

Source Multiplayer

• Improved multiplayer voice communication, now using a much clearer codec
  
• First release of a completely reworked in game text chat to which now includes a chat history and a filter to only see important chat messages
  
• Fixed not being able to use sounds, decals or models if they were downloaded from the server

Tell us what you think of the voice communcation and text chat updates... Discuss it in the forums!