Taken from neogaf:

"A new crowdsourcing project by Slightly Mad Studios for their next multi-platform (PC/XBox 360/PS3/WiiU) racing sim title called "Project CARS" (community assisted racing simulation) has started. For as little as 10€ (13.40$), you can by yourself a share of the game to help and develop/influence the outcome of the game. Right now the development happens on PC only (jr member you get a new build each month, team member each week, senior or higher even ofter) and the console version will be ported at a later stage (problems MS/Sony certification), to be able to run the game you will need at least:

Minimum PC Specs
CPU: 3.0GHz Dual-Core or 2.4GHz Quad-Core
GRAPHICS: Nvidia 9600 GT or ATI HD 4750
MEMORY: 2GB of RAM "

This is a great game and it gives you a really good look how a game is made.
You can follow the work in progress from day to day and see how they design there tracks.
And every week or month you can download a new playable build and see the improvments.

but rember that the game is in pre-alfa so dont expekt everythin to work as it should