Uber has officially launched in Tokyo: http://japan.cnet.com/news/service/35044892/

It still seems they only have about 5 cars in all of Tokyo, though. Has anyone other than joejones used their service recently? At a 30-50% premium over regular taxis, it only really makes sense during the late-night 割増 period (or if you simply want to look like a baｌler, I suppose :-P).