A Steam Client update has been released in anticipation of Half-Life 2: Episode One. Changes include an updated friends system, automatic file fragmentation detection and repair, out-of-date video drivers detection and a few bug fixes.

There is also a fourth teaser video for Half-Life 2: Episode One on Steam and probably on the usual download sites later in the day. Going by the timer on the offical Episode One webside, the game should get unlocked on Steam at 6pm BST.

Friends
* Friends is now officially released, ending the Beta
* Fixed case where friends list would show as empty
* Added prompt for new users to choose their Friends name

Defrag
* Added file defrag option in game -> properties dialog

Backup
* Improved speed & reliability of the Backup utility
* Added custom disk size option, in addition to the DVD & CD standard sizes
* Fixed case where backup would produce files too large for some CD burning software to handle
* Added an auto-run to created backups

Steam Client
* Added 'Games' option to settings -> interface -> favorite window dropdown
* Fixed developer name & icon not showing for mods in the games list
* Fixed issue causing apps a user owned to show as 'pre-loaded' in the games list
* Fixed case where steam:// hyperlinks wouldn't work for users who used a registry restore tool

Source Engine
* Updated base content with assets to support newer engine features