Sorry for being unclear.
FIFA08 and Harry Potter 5 (PAL Versions) WILL WORK on a US PS3 (NTSC) in SD mode at 480i/p.
Heavenly Sword will come up with an error message, when you try to play the PAL version on an NTSC system in 480i/p (however, to my understanding, it WILL WORK as well on an HD system). It's just the 576i/p vs. 480i/p that is the issue, once you play something at 720p, it seems not to matter, where the game originated, as the resolution is the same.
In other words, I have no problems playing PAL FIFA08 on my US PS3 in SDl, please change the list accordingly lmaolmao.

Will let you know about NHL 08 in a coupla minutes

.