Originally Posted by
msb0b
I too thought N'EX don't stop at Shibuya. At least they didn't in the few times I have taken it. The latest
time table seem to indicate otherwise though.
Shibuya is the terminus for the Ginza line so all trains go toward Asakusa/Ueno.

A gradually increasing number of N'Ex trains to Shinjuku (and beyond) are stopping at Shibuya now. I've been on a few that did. I believe this is part of the expansion that is intended as a cheap competitive response to the imminent opening of the new faster Keisei line.
I've never "activated" a Suica or Pasmo card, if it has value on it at least equal to a minimum ticket, it will work AFAIK.
The Megaweb thing on O-Daiba is actually a Toyota-run exhibit so that's all that you'll see there. The brakes seem to work on everything that moves.