All the rage: crowd-sourced radiation maps
A ton of maps are starting to pop up that mark radiation levels in various areas. Singularityhub has the rundown and lists a map made by Portland's Uncorked Studios as one of the best: "In only 72 hours they created RDTN.org, an online display of up to date radiation levels across Japan and neighboring regions. Their information is gathered from volunteer and official sources and embedded onto an adapted Google Map. Three days from concept to a working map that gives valuable and reliable data to anyone who wants it for free, and not a dollar was spent in its production. Amazing."