Well, we're in the 1080p era now, but we're not seeing that as a full-on standard by any means. Most of the games on the show floor (both at Sony's booth and at other booths displaying PS3 games) were running at 720p in the current build, although higher resolutions are being targeted for the final game. Here's a rundown of what we have been able to confirm regarding resolutions for PS3 titles:
Gran Turismo HD -- Full 1080p
WarDevil -- 1080p
Madden 07 -- 1080i
Mobile Suit Gundam -- 1080i on show floor
Resistance: Fall of Man -- 720p, aiming for 1080 in either form (an Insomniac designer says that the game can run at 1080 in the current build, but the team is weighing the trade-off in system power consumption at that res ... basically, they can do it, and now it's all up to what's best for the game.)
MotorStorm -- 720p on show floor, will stay at 720p but will get to (and hopefully be locked at) 60fps
Warhawk -- 720p on show floor
Heavenly Sword -- 720p on show floor
Eye of Judgment -- 720p
My SingStar -- *TBA
Genji 2 -- 720p
F1 '06 -- 720p, planning for full 60FPS but not necessarily any resolution bump-up
Virtua Tennis 3 -- 720p, planning for 1080i
Sonic the Hedgehog -- 720p
Untold Legends -- 720p
Heavy Rain -- *TBA (expected to be 1080p or 1080i, due to placement at booth -- the game was placed on monitor with a "1080" plaque, but this refers to the Sony monitor, and several PS3 games not at 1080i or 1080p were on these screens, possibly with TV-generated upscaling)
Indiana Jones -- *TBA
Full Auto 2: Battlelines -- 720p at show, the team is weighing options past that but with the defining factor being a 60FPS framerate above all else
Fatal Inertia -- *TBA
Marvel: Ultimate Alliance -- *TBA
Assassin's Creed -- *TBA
Tiger Woods 07 -- *TBA (demo is only tech concept, running on PS3 but not really a PS3 "game" demo)
Tiger Woods 07 -- *TBA (demo is only tech concept, running on PS3 but not really a PS3 "game" demo)
NBA Live 07 -- *TBA (demo is only tech concept, running on PS3 but not really a PS3 "game" demo)
The Club -- Only playable on Xbox 360 at E3
Tony Hawk's Project 8 -- Only playable on Xbox 360 at E3 Haze -- Only playable on Xbox 360 at E3 Rainbow Six: Vegas -- Only playable on Xbox 360 at E3 Brothers in Arms: Hell's Highway -- Only playable on Xbox 360 and PC at E3