The XBOX Live Marketplace has been updated. Here's the full list:
Content: Dark Sector: Boss Strategy Video (Colossus)
Price: 50 Microsoft Points
Content: Corbis Sexy Sprites Theme
Price: 150 Microsoft Points
Content: CP3TV.com: "This is my Louisiana…"
Also, the Halo 3 Heroic Map Pack is now free so what are you waiting for? A warthog?