The video on YouTube claims that it will not be there for long (so please watch it while you can) and links to a website in the Netherlands called "What's in the box?". This is a good reflection on Valve's own Half-Life product website (What is the Orange Box).
Either way, this video is truly remarkable in it's single-shot, first-person footage that incorporates many of the recognisable visual and audio elements from the Half-Life games. The special effects are superb!
What's in the Box? - Test Film 2009