Back then I was obsessed with Pratchett (and Robert Rankin). The Nightswatch series was really good (and a nice detective line among all the other genres Sir Terry fitted into the Discworld) - Captain Vimes was super (and Nobby was hilarious).Hah! It's been a while since I had any of my cherries broken save for that one, but you deserve it, laddie.
I'm not sure anyone can ever appreciate your game fully before he actually tries it out so I'm not sure as to what promo material would work. I think people's reviews are still your best option, so you just keep on doing your usual great job.
As for Sir Pratchett, well, if you ask me, he is the greatest author who ever lived and I have certainly read many. I've always favoured Captain Vimes personally, perhaps because I've felt closest to his character and reasoning, not to mention his WHERE'S MY COW rampage and his later taming of his inner deamon in Thud! still gives me the chills every time I think about it. Sir Pratchett certainly was a one-in-a-generation storyteller.
There was one character I really didn't like, though - this big, muscly, dumb ox that never noticed how attractive women found him. I forget his name, but you know the one... redhead, absurd sense of morality... heavy-handed suggestions that he was some sort of Chosen One. But really he was just some idiot hick who continually failed to adapt to the new situation... Oh yeah! It was Constable Carr...