G4TV has an online poll for who won E3. As of this writing here are the results.

Who "won" E3 2008?

Neither, they all sucked copious amounts of wang.

Neither implies two. There are three systems.

How in the world does 8% think Nintendo won E3?

Eh, I wouldn't say there is a clear cut winner.  The only thing I would say is it definitely wasn't Nintendo.

Unless used in conjunction with a plural verb as I did.

Wow why isn't their a nobody did voting section.

While they certainly didn't win from a gamer's perspective, one could easily argue that the games they showcased will be the best selling and money making ones at E3.  Also, if you look at E3 as a media event, one could argue that they got the best reaction from the mainstream press (their target audience).

I haven't seen any of the press conferences, but judging from the news I have noticed, nothing great was announced at all, and by great I mean exciting, so far it's all just a big 'meh'.

Perhaps Leipzig or TGS will bring the exciting stuff, seeing as E3 is clearly dead and no longer worth waiting for, well that's my opinion.