Mixing Genres--And Get a Copy of THE DEMI-MONDE WINTER

It's an interesting time in speculative fiction right now, with a lot of genre-blending going on. Maybe it's always been that way to some extent, but as I've done the Fiction Affliction columns over at tor.com the last year and a half or so, it seems as if I'm finding more and more books that I have trouble classifying. 
Initially, I classified books as science fiction, traditional fantasy, urban fantasy, paranormal romance, and YA paranormal...but where does time-travel fit in there if it's d...