Sam Loman created a map of the human body's systems using the style of a subway map. The different systems are color-coded as both anatomy books and trains maps are. http://www.behance.net/Gallery/Underskin/433072 -via Laughing Squid
Not bad - it is fun to look through. It looks like they got the biliary system and pancreas a little off. The way I understand it, a duct from the pancreas should join up with the bile duct leaving the gall bladder, then then enter the duodenum.
I'd totally buy (and wear!) a t-shirt with this on it.
Google is your friend.