Status after the earthquake

Power supply is now stable, while efforts are made to conserve energy.
Detail can be found here: http://www.tepco.co.jp/en/index-e.html

Airport: Both Narita Airport and Haneda Airport are fully operational.

Narita http://www.narita-airport.jp/en/index.html
Haneda http://www.tokyo-airport-bldg.co.jp/en/information/

See the government summary page: Japanese Air Transport after the
2011 Tohoku – Pacific Ocean Earthquake.

http://www.mlit.go.jp/koku/flyjapan_en/index.html

Train service: Operating regularly. Currently, the service is operating at 80% of the usual capacity to save energy; see e.g. here.

Radioactivity information
Shonan Village Center is 270 km away from Fukushima Daiichi Power Plant. Reading of environmental and drinking water radioactivity level at Kanagawa prefecture are within the range of past usual figures.