I only have PS3 and I agree with Uncharted, GT5P, R&C, Heavenly Sword, Motorstorm, Warhawk, Super Stardust HD, PAIN, and fl0w are all games with great graphics in their respective resolutions. Up coming games would be Killzone 2 (screenshots and videos from the current engine code are simply amazing, they've really turned it around from KZ1 on the PS2 which was still quite good) and of course MGS4.
With MGS4, while the graphics in the online beta weren't that good, the SP game looks like it will be the most stunning PS3 graphics yet, and so far the reivews I have seen/read have rated it highly, and going by MGS3 on the PS2 which really was the top in terms of graphics, I have high expectations from MGS4.