Real time plume spread map here. (Caesium 137 and Iodine 131).
(
English explanation is here). (WARNING: Likely to be biased .. COTO Report not exactly well balanced ..ie: propaganda
)
Radiation monitoring in Japan goes DIY - article here.
Real-time online geiger counter monitor reading of Japan here.
US radiation map here shows readings and proximity to Nuclear plants as well. (WARNING: Pretty heavily biased website, this one mind you … don't believe all it says. At least it shows some people are watching it .. more websites would be needed to check whether the info is distorted/biased ... )
Cheers