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 times faster
  
• Fixed uninstalled games showing "Download Paused" if you changed languages

News Source: Steam News

Updates to Half-Life 1 Engine have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:

Half-Life 1 Engine

• Fixed crash when downloading content in game if IE7 was installed
  
• Fixed viewdemo command not working correctly with some demos
  
• Fixed getting duplicate friends message when in game

News Source: Steam News