Valve has made a trailer for their upcoming FPS puzzle game “portal” available for those who are interested. It actually looks pretty good, and it was done with a nice sense of humor.
If you have Steam you can get it from Valve [url=http://storefront.steampowered.com/v2/index.php?area=game&AppId=922&]here[/url].
Otherwise check this Joystiq article:
[url=http://www.joystiq.com/2006/07/18/first-trailer-of-valves-portal-released/]First trailer of Valve’s Portal released[/url]