Just before the holidays, Test Drive Unlimited owners get a small present and some new content. One free car, and the ability to download a new pack of vehicles.

Name: Test Drive Unlimited 1971 Dodge Challenger RT in-game content
Price: Free
Available in: All Xbox Live regions
Dash Details: Contains free 1971 Dodge Challenger RT for users to view and race with. In-game currency still required for purchase at respective dealer.

Name: Test Drive Racers Guild Download Set
Price: 350 Points
Available in: All Xbox Live regions
Dash Details: Premium set includes the Ferrari 612 Scaglietti, McLaren F1 GT, Dodge Viper SRT-10 Coupe, Ruf Rt 12, Alfa Brera, 1971 Dodge Challenger RT and Edonis. In-game currency still required for purchase at respective dealer.

Info is directly from Major Nelson.