In reply to Bob L.

Thanks for the link, i am going to download some of that overnight (i have a REALLY slow connection).

You should check out the post I did after we completed the latrine; it answers some of your questions, and has a photo of the separating seat:
http://www.JFanjoy.com/blog/?p=1996
Basically, the urine goes out a separate tube to be applied to the garden as a foliar fertilizer, reduced 1:3 with water. The latrine is a dry-composting type, meaning that it uses the aerobic digestion process.

The family has a fair amount of maintenance, making these latrines "not for everyone". I made a handout that I will be posting soon, in .pdf format. Basically, they need to add cup of ash, sawdust, or lime after each use. Once a week, they add a cup of soil (to help inoculate with useful microbes) and stir it all up with a big stick. Once every 6-9 months, they have to do a "switchover" and take out the compost from one side, move the seat, and seal the hatches again.