I just finished reading Feet of Clay by Terry Pratchett. This was a good book, but I felt that the Watch stuff was getting a bit repetitive—the same old jokes and character traits. Next time I read a Discworld book, I’ll probably read one from another storyline.
Have you read Night Watch? If not, I’d highly recommend this: while it is a “Watch” book it very quickly becomes very different and is, IMO, possibly the best Discworld book.