I just can't get very excited about the DS. I have one, and I have a few decent games for it, but it just feels so gimmicky in my hands. I've yet to play a game that really makes proper use out of that touch screen... so far it's been game after game where the 'touch' is a pleasant addition, and hardly integral to the gameplay at all. I find that to be a failing of the system... but I will say; I have not played all the games for it, so there are probably titles out there that make excellent use of the touchscreen.
The PSP is something I could get excited about, and did, and still am! I love that I carry around a current-generation-console, in my pocket. The thing is just so damned powerful and versatile. On the way to work I can swap from playing Lumines, Hotshots Golf, THUG2, Wipeout, to watching an episode of Smallville that I downloaded the night before, or I can listen to the new Beck album on it. As a game system it excels, and as a portable mutlimedia device, it excels.
Nintendo needed a strong DS presence at E3. They need to reinforce their system, they need to maintain interest. The PSP came out, and was simply accepted. Sony doesn't NEED to hype it, because so many people are already comfortably on the bandwagon... whereas DS owners have had a bumpy ride so far.
So to say that the DS won the show is a lot like saying John Smith stole the PGA tour from Tiger Woods... but really, Tiger Woods was more interested in chilling out at the bar, having a few drinks, joking around with the rich guys... he's so comfortable, that he doesn't even make the effort.
Bizarre, and strained analogy, I know... but that's all I can come up with until I get more coffee in me.
[/soapbox]