Here is a thread that contains a collection of all the E3'09 trailers of various games, there is more to come, will update as necessary. If I'm missing anything, just post it in this thread
Dead Rising 2 - 360/PC/PS3?
Battlefield 1943 - PC/PSN/XBLA
Heroes of Telara - PC
The Saboteur - PS3/360/PC
Bayonetta - PS3/360
Supreme Commander 2 - PC/PS3/360
Mafia II - PS3/360/PC
Split/Second- PS3/360/PC
Alpha Protocol - PS3/360/PC
Rabbids Go Home - Wii
Just Cause 2- PS3/360/PC/Mobile
Tekken 6 - PS3/360
Warhammer 40k - PS3/360
White Knight Chronicles - PS3
No More Heros 2 - Wii
Dead Space Extraction - Wii
Need For Speed Shift - PS3/PSP/PC/360
Dragon Age - PS3/PC/360
Valhalla Knights: Eldar Saga - Wii
Dead Rising 2 - 360/PC/PS3?
Battlefield 1943 - PC/PSN/XBLA
Heroes of Telara - PC
The Saboteur - PS3/360/PC
Bayonetta - PS3/360
Supreme Commander 2 - PC/PS3/360
Mafia II - PS3/360/PC
Split/Second- PS3/360/PC
Alpha Protocol - PS3/360/PC
Rabbids Go Home - Wii
Just Cause 2- PS3/360/PC/Mobile
Tekken 6 - PS3/360
Warhammer 40k - PS3/360
White Knight Chronicles - PS3
No More Heros 2 - Wii
Dead Space Extraction - Wii
Need For Speed Shift - PS3/PSP/PC/360
Dragon Age - PS3/PC/360
Valhalla Knights: Eldar Saga - Wii