"Going Postal" is undoubtedly one of Pratchett's new millenium books. Devout readers will know what this implies: a rope-thick storyline and a more intricate plot rather than a thread-thin storyline packed out by an abundance of gags.
Please do not underestimate the humour of this book however; it is still exeptionally witty (and laugh-out-loud funny in places) but is much more in keeping with other recent titles such as "Monsterous Regiment" and "Wee Free Men" than the earlier laugh-fests of "Men at Arms" and "Moving Pictures".
Moist is an excellent anti-hero, if not a little stereotypical and therefore predictable, but what made this book for me was the expanded inclusion of some previously introduced Discworld phenomenon such as golems and the Clacks.
Another great point about this tale is the potential follow-up for both Moist and the eventual villain, which has all the setup for a book in its own right.
Oh, and Vetinari is still the funniest thing on the Disc :D