720p:

25 to Life
Amped 2
Atari Anthology
Charlie and the Chocolate Factory
Crash Nitro Kart
Disney's Extreme Skate Adventure
Dragon's Lair 3D
Enter the Matrix
ESPN Major League Baseball 2K4
(16:9 only in 720p
ESPN NBA Basketball 2K4
Evil Dead: Regeneration
FIFA Soccer 2006
FIFA Street
FIFA Street 2
Freedom Fighters
The Incredible Hulk: Ultimate Destruction
Justice League Heroes
Mortal Kombat: Armageddon
MVP Baseball 2004
MVP Baseball 2005
MX Unleashed
MX vs. ATV Unleashed
NBA 2K3
NBA Ballers
NBA Live 2006
Scarface: The World is Yours
The Sims: Bustin' Out
Soul Calibur II
4:3 window in 720p
Steel Battalion: Line of Contact
Street Hoops
Syberia
Terminator 3: Rise of the Machines
Tony Hawk's Pro Skater 4
Tony Hawk's Underground
Tony Hawk's Underground 2
Total Overdose
True Crime: Streets of L.A.
The Urbz: Sims In The City
Virtual Pool
The Warriors
World Series Baseball 2K4
X-Men Legends
X-Men Legends II: Rise of the Apocalypse

1080i
Atari Anthology
Dragons Lair
Enter The Matrix
MX Unleashed
MX vs. ATV Unleashed
Syberia

MX & Dragons lair look incredible, who would have thought the xbox could do that ey?