The Humanure Handbook
Two things:
I discovered that there is a free online (.html) version of the bible of composting toilets, The Humanure Handbook. It can be found here.
Came across this neat little website by a bunch of Kiwis who helped out when the sewers went bad in Christchurch after the earthquakes. They impart some really good, practical advice on
Different composting toilet designs, including the Christchurch twin-seater.
how to build a composting toilet. Unlike a lot of sources, they discuss both pee and pee.
A Desirable World 
Thanks for the link to the Humanure book. It is indeed the bible of toilets.
I have this book and it is the best.
I shall start it tonight.