Colin Smythe, Terry's agent and all round nice bloke, has released his new website dedicated to Terry's books. Loads of interesting information there and well worth a look.
I had a look at that this morning from Jason's link on Discworld monthly newsletter. It's a seriously interesting site with a massive amount of information.
Tony, could this be made a sticky post, so the link remains easily visible? Colin's site is such a mine of information, I feel it ought to be firmly linked.