Ok I tried out the new backwards games today...
Elder Scrolls III: GOTY Edition - Runs about the same as XBox, with the exception it seems a *bit* slower, especially in towns and the starting ship.
Sega GT 2002/JSRF Combo - Both run flawlessly. Especially JSRF.
Outrun 2006 Coast to Coast/Outrun 2: Outrun 2 runs a bit slower, especially when you run into the area before the next area checkpoints aka the highway. In 2006 it's alot less noticeable, and runs identical to the XBox version.
Guilty Gear X2 #Reload - Works flawlessly.
Auto Modelista - Works flawlessly.
PGR 1 and PGR 2 - Both run flawlessly.
Sega GT Online - Flawless.
KUF: The Crusaders -Flawless (outside of no Live play)
Silent Hill 2 (Ran flawless, including the FMVS)
*** WARNING THIS IS GOING TO SUCK FOR MVC2 SEEKERS and Justice League Heroes owners/future owners*
Marvel versus Capcom 2

Sorry guys but the game looks like shit. The characters are all blocky, they have lines through them which is real weird. The game plays fine but It detracts so much from the experience that this game is currently unplayable. I wouldn't be suprised if this one is pulled. eBay value will probably go up till people realize the issues.
Outside of MVC2 everything ran perfect (gonna test Justice League more, will update the post later).
Justice League Heroes - I played it for a bit and it runs fine in some areas. Others it tends to slow down a lot. This isn't a issue on the XBox, but on the 360 it runs slower. I just plugged in my XBox and went to play it on there for this title.