Xbox Live Marketplace - Call of Duty 4 multiplayer beta, Gears of War 2 videos galore

Here's what's new this week on Xbox Live Marketplace:

• Arcade: Vigilante 8 ($10)
• EndWar FirstWar Enlistment Pack (free for one week) with three unit upgrade unlocks
• Guitar Hero: World Tour Oasis Track Pack ($5.50, or $2 each) with "Bag It Up," "The Shock of the Lightning" and "Waiting for the Rapture" plus "Another Way To Die" by Jack White & Alicia Keys ($2)
• Rock Band/Rock Band 2 Presidents of the United States of America Pack 01 ($5.50, or $2 each) with "Dune Buggy," "Feather Pluckn" and "Ladybug" plus "I Don’t Care" by Fall Out Boy and "Use Me" by Hinder ($1 each)
• Demos: Call of Duty: World at War multiplayer beta, Lego Batman and NCAA Basketball 09
• Game Videos: Bayonetta, Call of Duty: World at War, FIFA 09, Gears of War 2, Left 4 Dead, Midnight Club: Los Angeles, Mirror's Edge, Mortal Kombat vs. DC Universe, Tomb Raider: Underworld and Vigilante 8
• Themes: Brothers in Arms: Hell's Highway ($1.25 and $1.88), Gears of War 2 (one free, the other two $3.13 each), plus HAWX, Tomb Raider: Underworld and Vigilante 8 ($1.88 each),
• Pictures: Mortal Kombat vs. DC Universe ($1.25 each), Tomb Raider: Underworld ($2) and Vigilante 8 ($1 and $1.88)

What's even cooler is that next week's haul will include the Left 4 Dead demo and Foo Fighters' The Colour and the Shape album for Rock Band...