Terry Pratchett Challenge!

I've never read Terry Pratchett, but I've heard amazing things about his books.  Seems like a challenge is in order, no?  This challenge is hosted by Once Upon A Time, and I adore the simplicity!  Set your own goal, as long as your goal is to read some Pratchett!  Re-reads and all formats acceptable.  :-)

My goal is to read at least one book this year (lame, I know).  Any recommendations????