I mostly read a lot of non-fiction like history books and such (especially on the Celts and Saxons), but I'm just about finishing "Three Hearts and Three Lions" (1953) by Poul Anderson, an old classic. There's a lot of ideas in there that helped inspire Dungeons & Dragons that might be interesting to you.
Also, movies provide some great ideas. I recently saw "Pirates of the Caribbean" which was very cool. It's interesting because an adventure by Atlas Games called "Maiden Voyage" published a couple of years ago had a similar undead pirate thing going on. Good stuff.