I guess it fixes a host of problems and I'm glad I caught it right before I was going to bed.
A Steam client update is now available. To apply the update, click the File menu inside of Steam and then select "Check for Steam Client Updates...". The specific changes include:
Steam Client
* Fixed possible case where Steam would get stuck with "Downloading starting..." when trying to download
* Added NTFS check when trying to install Empire: Total War
* Added new dialog to inform the user they failed to register a CD key because they do not own a game which is required to register the key (Empire: Total War Special Forces)
* Added more download regions for Australia
* Fixed several update news links for games going to the wrong page
* Added more information to the game launch display when first-time install steps are being ran
* Fixed HL2.exe hanging on shutdown
* Increased max width of links on game properties dialog (general tab) to match the now wider properties panel.
* Fixed the 'launching game' dialog always waiting for user input if there was update news available
* Updated localization files for dialog variable changes (fixes %s1 appearing in some languages)
* New notification shown when an application is downloaded or updated
* Added teamfortress.com, tf2.com, etc. to list of approved chat urls
* Fixed case where retail install would be unnecessarily slow
* Fixed third-party installers not running if an installer before it failed
* Several Steamworks updates
