A book every nerd needs in his bar. TSR's Deities and Demigods. I have a few of my D&D books in the bar. Have never used them to play D&D there but I was using them quite frequently. They are are a great reference for doing game dev work. Quick place to find that name for a ship you need for a mission. This has been used more for game development than it ever was for playing D&D.
First 100 Episode Recap | Second 100 Episode Recap | Third 100 Episode Recap