Sony without question.
The killzone showing, even for a pre-alpha, was incredible. nobody in their right mind is disappointed with the performance of that, and everyone expected them to fall FAR short of the target render.
New PSP is everything the old one should have been. Cache to memstick enabled, VIDEO OUT, 30% lighter , BUILT IN MEMORY (but only 64 megs lol)
Good showings for MGS4, GT5, Unreal Tournament is exclusive (temporarily), GREAT looking game from sucker punch, HOME is looking MUCH better than it did before...VERY impressive.
Microsoft- Terrible looking new Halo Sku, Some good content from disney coming to live, marathon on live arcade is a good thing
Nintendo- Sales-age charts we're all familiar with, the zapper we knew was coming a year ago, and wii fit? pass. nintendo got really lazy with this E3. but then again their momentum is so high at the moment they don't really HAVE to put on a good show. The audience they're aiming at isn't watching E3.