There will be a thread for the initial press conference, which'll contain all of our intitial reactions. Then, there will be seperate threads on each thing of interest (Mario 128, Mario Paint Wii, Kid Icarus DS etc.) in both the relevant system sections and in Talkback.
It's not a perfect system, but it works.
As for the ideas in this thread, I think a seperate E3 section would be nice, and agree with Ian that consolidated threads aren't the best.