Composting worms are used in toilets/latrines in rural areas of some countries but are little used yet in developing countries.
One worm system has been in use for over 20 years is in Australia http://www.wormfarm.com.au


We have obtained information about the Oxfam Tiger toilet. It can be downloaded here Tiger toilet

http://www.hydratelife.org/?p=539

However good information about installing simple worm latrines is not yet available - more later!