ATI and VALVE have teamed up to give you the chance to play Half-Life® 2. The demo features some of the amazing digital actors and physical gameplay that has made Half-Life® 2 the leading contender for Game of the Year 2004, the demo takes players through some of the early levels of the game and later transports them to the area of the game known as Ravenholm. The demo will debut on ati.com, and requires a Steam account to install.
The demo can be downloaded here (700MB).
If you are interested in the full game you can buy it here at Amazon.com.