First iPhone, then Final Cut Pro, now iPad. Along with silent, yet significant, growth of Maps and the software updates of increasing frequency, these are starting to look like pre-shocks to something really big.
As Red Light as you can get in Japan... save for maybe the alleys around Ueno station. It's a shame too, Roppongi is totally different during the day. All the odd shops around there are really neat. Stick to Shibuya for the night life.