Re: Pratchett Essentials
For intelligent humour (in certain stories at least), try Fritz Leiber. The last two stories in Swords Against Death were hilarious - much moreso than Pratchett, even if they don't last long. Anyway, the Fafhrd and Gray Mouser stories are excellent, though when Leiber puts in humour they are extremely funny. I've only read the Colour of Magic so far though. And Pratchett did make a slight reference to them - Bravd and Weasel were basically take offs of Fafhrd and the Gray Mouser.