Hi noseprints,
A lot of abbreviations, I know...
MC = meta-coordinator. That's the volunteer who sets up the project in the Librivox (LV) database, and when everything is read & proof-listened he/she does all the behind-the-scenes stuff to get the project in the catalog to make it available to the whole world.
lz = that is the abbreviation for lezer - and that's me! I'm the MC for this project. On the LV uploader, you choose which folder to upload the recording to, and for this project it is my folder, so named "lz - lezer". The lz in the title makes it easy for me to see which are the projects I'm involved in.
BC = book-coordinator. That's Wassermann in this case. He does all the coordinating of the readers & proof-listeners, getting all the sections in etc. So he's the one who assigns sections. I'm sure he'll be along after the Christmas/New Year business is over.
A good place to look for more info on LV is the wiki:
http://librivox.org/wiki/moin.cgi/
This also contains a glossary where you can find all abbreviations explained (well, theoretically all of them...)
http://librivox.org/wiki/moin.cgi/Glossary
Regards,
Anna