Japan radiation fallout map...

The National Radiation Map, depicting environmental radiation levels across the USA, updated in real time every minute. This is the first web site where the average citizen (or anyone in the world) can see what radiation levels are anywhere in the USA at any time

Blackcat Radiation Network
Mineralab - Radiation Network



UPDATE 3/16/2011:

Radiation detected in Bakersfield, California...the map is at:
http://www.BlackCatSystems.com/RadMap/map.html

RADIATION reaches USA March 16, 2011 234 uR per hour


Forecast for Plume's Path Is a Function of Wind and Weather - Animation Feature - NYTimes.com

http://www.usatoday.com/news/world/2011-03-17-japanradiate17_ST_N.htm

http://news.yahoo.com/s/ap/20110316/ap_on_re_us/us_west_coast_radiation_monitors

UPDATE: 3/17/2011  
Radioactive fliers land in US

Two flights that originated in Tokyo and landed in Dallas and Chicago yesterday triggered radiation detectors when passengers passed through customs, The Post has learned.

Tests on the jet that landed at the Dallas-Fort Worth airport showed low levels of radiation on the travelers' luggage and inside the cabin's filtration system.

NYTimes U.S. Calls Radiation ‘Extremely High;’ Sees Japan Nuclear Crisis Worsening

UPDATE: 3/27/2011

Crowd-sourced realtime radiation monitoring in Japan

UPDATE: 7/21/2011

Ex Japanese Nuclear Regulator Blames Radioactive Animal Feed on "Black Rain"