Listen to episode 140.
I talk about the problematic nature of Appendix N, thanks to a call-in from Chris Shorb. Then I discuss the two works I read recently: The High Crusade by Poul Anderson and The Fallible Fiend by L. Sprague de Camp. To make a long story short, I liked Crusade better but Fallible Fiend has more "D&D" stylings. Both are short, easy to read, and humorous.