I know some people are wary of Potrblog's readings because they have been so high but I have admired their willingess to post their data and methodology for public review.
Tepco has acknowledged that radiation emissions from the Fukushima plant are now higher than they were in December and yet the radnet readings have not demonstrated higher levels.
My unsubstantiated hunch is radnet is now actively censoring because my area was under the jet stream over the last few days but did not readings above 300cpm beta. In December we had levels in my area of up to 850cpm beta.
Potrblog's results are what I would expect given increased radiation emissions from the plant, especially when coupled with the fires that have been spotted by numerous observers on the two webcams focused from different viewpoints.