I'm impressed at the commitment to re-read all the Discworld, that would pretty much comprise my entire reading list for a year, and I don't think my mind would be in a very good state by the end of it.

I've read them all through in order, starting when I came to college and had them forced upon me by an enthusiastic icsf librarian, but have only re-read a couple of the early ones. How do the older ones stand up?