From the back of the box:
Fuel your Fantasy
Take the wheel of the complete racing simulation experience. Forza Motorsport 2 raises the bar with authentic handling, bone jarring damage, lifelike audio, photorealistic graphics, real-world upgrade parts and millions of customization options.
A Live Community - Experience the intensity of 8 player races over Xbox Live. Compete in worldwide player tournaments or watch the action on Forza Motorsport TV.
A Complete Collection - Collect over 300 of the hottest cars from the world's leading manufacturers such as Ferrari, Porsche, Lamborghini, Nissan, GM, and more. Express your inner artist by personalizing your cars in the paint and decal editor. Take photos of your masterpiece, then upload to forzamotorsport.net and download to your PC from the website. Or auction them off to other gamers over Xbox Live.
Fresh Tracks - Race famous circuits from around the world - Mugello Circuit, Mazda Raceway Laguna Seca, and Suzuka Circuit.
Tuned to Win - Maximize your performance by installing hundreds of performance upgrades including turbo chargers, suspensions, body kits--even full engine swaps.