I have a Toshiba 72MX195. It hooked up well enough, though I initially was receiving some feedback to my receiver through the HDMI connection. I eventually fixed this through my receiver's settings, but not sure how. I also believe that the PS3 has to be turned on before my receiver for proper sync.
I've played PS1 and PS2 games, and they look good, though the sidebars remain, hope this gets fixed.
Resistance looks great (though not as good as Gears of War) and I believe it defaults to 720P if you have 720P and 1080i checked in the PS3's display settings. My TV upconverts to 1080P so I try to get 1080i output whenever possible.
Standard DVD looks horrid, 480p I guess; but Blu-Ray seems to look well enough, I've only played the 5th Element and I have read it is far from the best BluRay disc.
Quite happy with everything for now, but it seems there is a lot of room for firmware improvements.