Do you know the difference between a slider and a mini-burger? There's a great guide at A Hamburger Today. (Link via Kottke.)
I used to work for a regional magazine and was occasionally in charge of cover stories where we had to go out and review 25+ burgers for a cover story. Rob and I definitely developed different terms for different styles of burgers, but not this many. I think we had "type A" and "type B," and one was a more satisfying, gourmet restaurant style of burger, while one was more fast-foody.