Amazon.com has a feature that I don't think gets used very much--at least not for YA books. You can "tag" products with keywords, much as bloggers tag posts (other bloggers, that it, I always forget). Like so many Amazon "features," it's buried among a million other bells and whistles and you're not likely to see it. There seem to be some exceptions, though, for certain special areas of interest. For instance, The Tree Shepherd's Daughter by Gillian Summers is an urban faerie (and elf!) fantasy for which we have high hopes this fall, and it's just now in stores. I noticed on its Amazon page that it's been tagged "elf" several times as well as "fairy" (both spellings!). I don't know if it's just me, but there's something pleasingly appropriate about a book with elves and faeries acquiring mysterious "tags," seemingly overnight--tags only likely to be seen by those with "faerie sight."