Discworld interrelations map

One of the things I especially love about Terry Pratchett's convulsively funny Discworld fantasy novels is that even though they are numerous and interconnected, they are not, particularily, sequels to one another. So this chart that plots the interrelationships — temporal and character — between the Discworld books is quite a handy way of referring back to the canon and finding connections you may have missed the first time around.