Latest Daiichi Readings

This is the best way to visually interpret current data from the reactors at Daiichi. This tool uses the 6 hour CSV data from TEPCO and puts it into a graph format so you can detect trends and changes. The page is in Japanese but translates with Google Translate
http://fukuichi.mods.jp/?p=5%2C6%2C7%2C8%2C10%2C11%2C23%2C37%2C38%2C39&fname=p34.csv&cnt=120&update=Update

Some other updated links for daily or hourly monitoring at the plant:
Monitoring posts at the plant (daily) http://www.tepco.co.jp/en/nu/fukushima-np/f1/index-e.html
Exhaust stack of units 5-6 (daily) http://www.tepco.co.jp/en/nu/fukushima-np/f1/stack/index-e.html
Radiation survey maps (reactor buildings, inside reactors, around the plant) updated periodically
http://www.tepco.co.jp/en/nu/fukushima-np/f1/surveymap/index-e.html
Reactor Parameters (hourly, 6 hours) http://www.tepco.co.jp/en/nu/fukushima-np/f1/pla/index-e.html

There is some ongoing data made available but most are in fairly static formats.
Newest monitoring post-radiation readings: http://www.tepco.co.jp/nu/fukushima-np/f1/index-j.html (In Japanese but translates with Google Translate)

Reactor data tables have been moved to a once-a-month document published with the roadmap report. Older table summaries up to early 2013 can be found in the link below.
Newest reactor parameters: http://www.tepco.co.jp/nu/fukushima-np/f1/pla/2012/images/table_summary-j.pdf (In Japanese but readable if you are familiar with the format)