Figuring out just where to start Terry Pratchett's sprawling, character-dense Discworld series can be a little daunting. Fortunately this chart, lets you figure out just how to follow your favorite storylines and characters as they move from book to book.
Aside from the fact that Terry Pratchett is my fave writer of all time this is one of the best articulations of this view I have ever read. (for those interested this is Death talking to his granddaughter Susan)
Greebo, Nanny Oggs cat. A a Terry Pratchett creation "To Nanny Ogg he was merely a larger version of the little fluffy kitten he had once been. To everyone else he was a scarred ball of inventive malignancy."