Valve announces that preloads are now underway for Half-Life 2: Episode Two on Steam in anticipation of the release of The Orange Box one week from today:

Portal, Half-Life 2: Episode Two Pre-Loading Now The Orange Box will be available via Steam and at retail outlets beginning next Wednesday, October 10th. In preparation for launch, Valve has begun pre-loading both Portal and Half-Life 2: Episode Two to those who have pre-purchased The Orange Box. The pre-purchase campaign, available via Steam and at participating retailers, grants gamers access to the Team Fortress 2 beta and extends a 10% discount off the regular price of $49.95.