pets can carry diseases that are infectious to humans, so it's important to be sure you're using a composting method that will kill germs and parasites. you can either get the pile really hot for a few days, or age it two years or more before using the dirt (which deprives bad bugs of their living hosts, so they die out on their own).

i don't have any direct experience with composting pet poop, per se, but on a tangentially related note i set up a sawdust toilet system in my house TODAY. talk about being on the same wavelength! :) i plan to compost the dog's deposits in there, too. see jerry jenkins' book "the humanure handbook", or visit www.jenkinspublishing.com/humanure.html.