Updates to the Steam Client have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:

Steam Client

• Added support for PayPal; customers can now shop on Steam and pay using a PayPal account
  
• Fixed Source engine mods not launching correctly on 64-bit systems
  
• Fixed case where Steam could run multiple instances simultaneously on a single machine
  
• Fixed Steam store not showing game install status correctly when a large number of games were installed

Updates to Counter-Strike: Source and the Source Engine have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:

Counter-Strike: Source

• Fixed a crash which could occur if the dynamic weapon price list failed to download

Source Engine

• Added new cl_restrict_server_commands to prevent unwanted commands being run on game clients. The default value is 1, valid settings are:
  
  • 0 = Don't restrict any server commands
    
  • 1 = Restrict server commands in Valve multiplayer games
    
  • 2 = Restrict server commands in all multiplayer games
• Decreased startup time in some cases by rate-limiting the packets sent to clients during logon
  
• Improved responsiveness when entering map areas with lots of entities by automatically compressing large packet updates

Updates to the Steam Client have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:

Steam Client

• Made startup and store loading times faster
  
• New hardware survey