Yes, one of the most popular games by our friends at CryTek and Ubisoft has been release as a free "Ad supported" download.
Synopsis from Wikipedia:
"Far Cry is a first-person shooter video game developed by Crytek Studios from Germany and published by Ubisoft on March 23, 2004 for Microsoft Windows. Far Cry sold 730,000 units within four months of release and has sold, as of Jan 2009, 2.9 million copies worldwide. It received positive reviews upon release, and critics labelled it as one of the best first-person shooters for PC. The original game has since spawned several console ports and a movie."
Now you too can download and play the game for FREE!!! But there is a catch, you have to be registered as in the United States. Hopefully soon Ubisoft will remedy this situation considering just how popular the game was/is.
Download it from here: Download FarCry - Digiex