As of 3/13, 5pm, radiko (Internet radio) eliminated its area restrictions and anyone can hear its streaming from anywhere in Japan. You can listen to the below stations at radiko.jp or radiko smartphone apps, but due to the high traffic, stations are requesting that non-emergency listeners refrain from accessing the site, and give priority to Tohoku area residents.
Kanto Area: TBS Radio, Bunka Hoso, Nippon Hoso, Radio Nikkei, InterFM, FM TOKYO, J-WAVE
Kansai Area: ABC Radio, MBS Radio, OBC Radio Osaka, FM COCOLO, FM802, FM OSAKA
NHK TV is re-streamed on uStream, NicoNico Douga, Yahoo. NHK Daiichi Radio is streamed online simultaneously.