I have a soft spot for Moist von Lipwig... And my signed copy of 'Going Postal' is never read, for fear of damage!
You should give the young adult books a go they are really good, and I'm 35, also for completeness they tie up some of the "witches" story lines. Plus they feature the nac mac feegle who are a perfect mockery of the scots P.s I've read them all and the City Watch stories are my favourite