Discworld is a delightful place--with passionate fans. Some random thoughts:
I'm particularly partial to the Granny Weatherwax books (
Wyrd Sisters fits here. Some people find
Color of Magic (one of the earliest books) a little labored and slow moving, but there are funny bits and a great comic artiste is entitled to an experimental book or so to find his stride.
One of the advantages of the multiple plot strands is that Pratchett continues to use the Discworld setting without going stale.
This link is to one of the official websites:
http://www.terrypratchettbooks.com/discworld/
Like Harry Potter fans a number of Discworld fans build their very own pages of homage. Gaming addicts (on and off line) have a number of pages.
Terry Pratchett is THE best selling author in the UK--and has been knighted for his contributions to the British trade balance. At present local fans from the Terry Pratchett's Somerset town are arguing with the British Tourist Board which keeps insisting that "twinning" with imaginary towns is not officially allowed. Everyone who is anyone knows that Ankh-Morpeck (the capitol of Discworld) is real.
Pratchett's style is veddy-veddy British--somewhere between Wodehouse and Monty Python. He uses both under statement and over statement and delights in word play. You got some of the flavor reading
Good Omens
Enjoy a glorious new dominion!