Core77

Dan Formosa and Paul Hamburger have designed and written a book explaining the rules of Major League Baseball. Says Dan: "The official rulebook of baseball is complex, and reads like a legal document--so it was a prime target for an information design project." And if the website is any example, these guys know how to lay out information.

(Bonus: Pictured above is a screenshot of the Amazon page, where it's recommended to buy the old and new testaments together! Now that's information design.)

Website here; Sample spread here; Infield Fly Rule here; Buy it here.