Sony just announced 2 games, thats about it. God of War was expected and the "Massive Action Game" (Who chose THAT name?). Both Videos were rendered and are about to be released in 15 - 20 months.
Personally I think MS won the e3, not just with the FF announcement, but with universal - nbc - netflix deal. And they actually showed games that are about to release in 3-4 months like Gears of War2, which looks awesome, and Fable2. The new Xbox Live is great, too. And the Fallout3 exclusive download content could be nice.
But keep in mind, what MS didn't show: The word "Halo" wasn't used once, and there is Halo Wars coming out, Halo Chronicles and "Halo Blue" (That is what I heard). Also no Forza3 and no Alan Wake. But Sony still has GT5 and Tekken6.
But Nintendo was funny. They had NOTHING to offer. I know, these games will sell more than well, but quantity is not quality. As a hardcore gamer, that was just nothing. But Nintendo is doing a great job with their marketing. Who the hell uses a Nintendo DS as a cooking guide? I loved the situation as the mid-age lady said "Who doesn't know this situation, your at an airport, you are in a hurry, you don't know where your gate is... Wouldn't it be great if the DS could help you out?" I was like WTF? Okay, i am not the typical tourist-guide, I might be at an airport twice a year and I never ever wished to have a Nintendo DS in my pocket!
But @topic:
I think it will help MS a little bit, but the boost won't be that huge.