Ahh, I remember enjoying the Thieves' World books when I was a young man. I think it was a PnP RPG, too.

Edit: Well, they put out some materials to adapt Thieves' World to D&D, it seems, thanks to Google. http://www.thievesworld.info/roleplay/rpg-original.htm Got a kcik out of seeing mention of The Vulgar Unicorn. Google, I'd have your baby, if you asked me to.