I was browsing through MS website and found a link to test out new games from MS. As a gratuity, you get to select a list of the following products for free if you get selected to participate in their testing. Good luck!
Here's what Microsoft's website say:
You may select one gratuity from an extensive list of our most popular games, including:
* Rise of Nations: Gold Edition
* Zoo Tycoon 2
* Dungeon Siege
* Flight Simulator 2004: A Century of Flight
Xbox titles now available!
* Project Gotham Racing 2
* Outrun 2
* Kingdom Under Fire
We've also added a few additional software items for those who prefer an alternative to game titles. These include:
* Digital Image Suite 10.0
* Publisher 2003 with Digital Imaging
* Money Premium 2005
* Windows XP Professional