I found this enlightening article about the rabbit parasite Encephalitozoon cuniculi (say THAT three times real fast) over at Worms & Germs. It fits right in with my recurring theme of zoonotic diseases on this blog. I suppose if I were smart I would just post links to Scott's blog all day long and save myself the trouble of writing anything at all. He's always informative and often entertaining.
The Dr. Gayle take-home message: if you have bunnies, don't eat bunny poop, and wash your hands after handling them. If you are immunosuppressed, wash again (or reconsider the whole bunny thing).