A “beta edition” of the Science Fiction Encyclopedia’s third edition (which is online-only) is up and available to the public.
Here’s One Question and Answer From the FAQ:
Q: What exactly is a beta text?
In this context, it means a text of the SFE that isn’t yet complete. We think we’re about 3/4 of the way through compiling the Encyclopedia. Our current 3.2m wordcount will probably expand to 4.2m by the time we’re done at the end of 2012. So there will be some entries missing in the beta text, and some cross-reference links that aren’t yet working. Of course, we hope that 3.2m words will be enough to occupy everyone for a while…