There's fresh demos on Xbox Live for both those who like to run-and-shoot and those who like to, uh, drive. First you get to exchange some blood for oil in the near-future FPS Frontlines: Fuel of War:

Content: Frontlines™: Fuel of War™ Demo
Price: Free
Availability: Not available India
Dash Text: [ESRB: RP (Rating Pending)] Frontlines™: Fuel of War™ is an open-world First Person Shooter set on the frontlines of tomorrow. In a world ravaged by a global energy crisis, environmental decay, and economic depression, players assume the role of an elite soldier in the Western Coalition Army on an epic crusade against the Red Star Alliance to control the last of the world's oil reserves. Frontlines: Fuel of War combines intensely cinematic, non-linear game play, with next generation weaponry and a revolutionary Frontline Combat System™ to deliver the most thrilling and engaging FPS to date.

And then you can pump that sweet crude straight into your "pimped out ride" to fuel your Burnout Paradise antics:

Content: Burnout™ Paradise demo
Price: Free
Availability: Not available in Asia
Dash Text: [ESRB: E10+ (Everyone 10+)] Welcome to the burnout paradise Demo. Explore Motor City, Big Surf Beach and Ocean View. Discover Jumps, Stunts and Smashes all over the map, and if you're online invite friends to join you for some challenges. Remember, this is just a small part of Paradise City. For the full Burnout experience, buy the full game coming in January 2008.
Size: 835.53 MB