When it comes to the plant data, TEPCO remains to be the only game in town, whether you like it or not.
For those of you who are interested in the most recent plant parameters on Reactor 3, the latest data continues to show Reactor 3's Primary Containment Vessel's pressure is more than atmospheric pressure, that they are measuring temperature of the Reactor Pressure Vessel and there is temperature (about 34 degrees Celsius), about 10 degrees Celsius higher than the Reactor 1 RPV. They are spraying water using core spray system, indicating the RPV is there.
From TEPCO's Plant Parameters page (English), latest plant parameters as of May 7, 2013 (click to enlarge):
Reactor 3's Spent Fuel Pool, now covered with steel sheets, does have spent fuel assemblies in it, as evidenced by the temperature rise of the pool water when the cooling stops (like the recent stoppage because of a dead rat) as well as visual.
Plant status from May 2, 2012 shows Reactor 3's RPV temperature was much higher (nearly 60 degrees Celsius). The CV pressure is about the same, so is the hydrogen concentration inside the CV:
I've been waiting for a very long time (almost two years) for TEPCO to publish the result of measurement of radioactive materials (density and type) from the swipes that the workers took from the floor of the reactor building. From my post on June 10, 2011, the first floor of Reactor 3 had a spot with 100 millisieverts/hour radiation at one meter off the floor, and the area looked blackened with soot:
I've been also waiting for the test result from the cleanup job by Packbot in November 2011 along the very wet equipment hatch rail, where the robot encountered 1.6 Sievert/hour radiation about 30 centimeters off the rail. It took TEPCO another five months to admit that the equipment hatch had been open all along, leaking radioactive steams and water.
I don't think workers, carbon-based or non-carbon-based, have entered the Reactor 3 building since April 2012.