The Anatomical Museum in Modena, Italy, has a very cool collection of obstetrical models made by Giovan Battista Manfredini in 1775.
http://www.armamentarium.net/SitoNuovo/1-%20Museo%20Modena.htm [warning: teratology section at the bottom of the page is gross and distrubing, but now that I told you this, can you resist?] - via Scribal Terror
that, and the fact that the pregnant women peel back their own skin for you so you can see inside. aren't they just so sweet and helpful?
but conjoined twins in various degrees of conjoinment does not me out. people are people and come in various shapes and sizes. just be respectful. :) (see previous neatorama entry on the Hensel Twins.)