Forza Motorsport 3 (FM3) finally came out on October 27th, 2009 after years of development. There are few games that I have been more personally excited about. For the Xbox 360 console, there just was not as solid racing game as Grand Tourismo until Forza Motorsport 2. Forza 2 featured hundreds of cars that were upgradeable, realistic tracks and solid racing simulation.
In summary, Forza Motorsport 3 builds on FM2 by adding more tracks, more cars, more car customization, superior graphics engine, improved driving simulation, improved Xbox live capabilities, more single-player game options (drift/drag,etc) and interior driving views of every car.