I spent six months in Tokyo in 2003. There was this one guy I saw sometimes on the commuter train who used a cellphone pc card in a 15" PowerBook to be online while doing his daily commute. Most people (90% of teenagers, and maybe 25% of adults) were constantly texting on their cellphones. And there was the odd duck with a miniature pc notebook on-line. Yes, they do like a lot of things small over there. But most people don't have a laptop out on their commute. I think the 13" is adequate for Japan.