After many months of instability culminating in a major crash, we have decided to imply migrate to the next version of our content management software, Noosphere 1.5. As of now all data since late 2011-10-23 has been lost, and some functionality is broken or missing. Please be patient and report problems.
I sincerely hope PlanetMath survives this setback. Oh, and Noospere 1.5 looks great!