Valve has sent word that Half-Life 2: The Orange Box will be unleashed at midnight:
"We'll be unlocking The Orange Box products just after midnight Pacific time next week on the 10th of October. Lots of people have been having a lot of fun with the Team Fortress 2 beta, so we're looking forward to seeing what people think of Portal and Episode Two. The Orange Box will also be available at North American game retailers later on the 10th, for both PC and Xbox 360."
[That means 12AM on the West Coast and 3AM on the East Coast in the United States.]
For now, enjoy this Orange Box TV trailer.