Well there's a news article here saying police in Ichinoseki are using amateur radio to gather information: http://www.iwanichi.co.jp/ken/item_23064.html
Once the situation has stabilized, we'll probably get news through the JARL about what amateurs in Japan have done after the disaster.
Currently, the latest news posted on the JARL's website was posted a few hours before the quake, and was about emergency communications rules.
As for hearing Japanese stations, yes the DX clusters show Japanese stations heard in the US, Europe, Asiatic Russia, etc. but I don't know if any those are in the affected area.