Music is probably my biggest inspiration. If I know I'm going to write a historical fantasy, I put on the Enya/Celtic harp. Historical? The music of the time period.
Lately, it's been movies. My kids decided to watch a Harry Potter movie every Friday, and currently we're on Goblet of Fire. I tell you, it amazes me, the depth of Jo Rowling's imagination. People say she's too fond of adverbs, etc. etc. etc., but she is an amazing storyteller and frankly, if you get so lost in a story you don't notice the imperfections, THAT is what I call success.
Great storytelling inspires me. Now on to what I've been attempting to do!