Great flick. I've got a book called "Very Special People" that bios the lives of a lot of the actors in that movie - and a lot of other famous "freaks", as well.
Related: If you liked the movie, you might also want to check out the interactive pc "games" The Resident's
Bad Day on The Midway (
review) &
Freak Show. They're over 10 years old, but still pretty heavy stuff.