OK I just fiddled with my PS3 and the different RGB Settings, outputs etc.
1) WRT the new 1.80 PS3 DVD upscaling, is nothing short of amazing!! It actually looks better than my Denon 3910. I saw little difference on the PS3 between 720 and 1080i, with a slight edge to 1080i.
2) I know what has been posted here regarding RGB, but with my PS3 (HDMI) I cannot see BTB on my projector, unless I set RGB to full, then it is very clear (AVIA Pro), and my color-space gets better too.
So for me at least, RGB = Full, and Super White = On; looks amazing.