I just re-organized mine.. by subject.. and/or technique. I have all the baby and children's book together.. all art books together.. of course there are always those that really don't fit any catagory.. so I have them all together. When I sit in my room and thumb through my books, I use sticky notes to help me find those things I'll want to find again! I love just to sit and look through my books.. they are good friends. I keep my quilting books in one bookcase.. my other sewing, knitting, crochet, wood carving, basketry, needlepoint, etc. in another bookcase. Works for me. I can generally find what I want, when I want to find it!!