Well, this from the US Consulate in Tokyo today:
"Farther from the reactor site, radiation monitoring by the Japanese government, U.S. government assets, the International Atomic Energy Agency (IAEA) and the World Health Organization (WHO) all indicate that levels of radiation measured in Tokyo as well as Saitama, Chiba and Kanagawa prefectures remain at background levels, well below levels which are dangerous to human health....We have consistently observed normal background levels of radiation."
So it looks like I didn't get any exposure whatsoever. Anyway, its still good to be out of there and not have to worry about it.
UPDATE: OK, now I'm pretty happy I left. On Tuesday as I was jumping on the shinkansen out of Tokyo, it was reported that the radiactive iodine in the tap water jumped briefly to twice regulatory levels. Mothers were warned to keep infants away from it. Once its in the tap water, you are going to get exposed there's no way around it. You have to shower, food has to be washed, noodles boiled, clothes laundered. There's been a run on Tokyo bottled water. And the #1 real unspoken fear still boils under the surface.... if there is a big catastophe up north, Tokyo will turn into a huge mob running for the exits like rats off a ship. There will no way to escape from that kind of situation. I'm glad to wake up in Kyoto today.