I know I don't have to read them in publishing order, but I've noticed that Pratchett would have gags that would start in one book and be mentioned in several subsequent books, so it helps to know the original gag to make the next ones funnier. Plus I get to see how the writing and world-building evolves over time. I'm a quick reader when I want to, so I'm hoping I'll get to Feet of Clay by this time next week.
Men At Arms was actually the first or second book in the series I read, and it remains my favorite.
Thanks for the art! I'll see what I can do with it. And the Angua pic looks awesome!