[quote:a6f54810ea="Buzzfloyd"]I recommend reading them in order of publication, although theoretically you can read them in any order.[/quote:a6f54810ea]
Generally reading them in any order is true, but (and I had this from Pterry Himself at a signing session) you should read "Witches Abroad" before you read "Lords and Ladies". Otherwise, any order will work, but things make more sense when read in the order of publication - especially the Watch series - but if you can't get hold of the earlier books, don't let that stop you reading the later ones!