We have acquired an amazing new bookshelf, so now we have a classroom library. I had grand ideas of labeling and shelving them all according to Dewey Decimal, but I decided to use a simpler system for our little guys (this simpler system just happened to coincide with my running out of time and energy!). Each subject has a co-ordinating washi tape on the spine and it' spot on the shelf. It's working well so far! We do have check-out cards in the backs of most of them and a stamp for checking them out. We're trying to incorporate some real life/role playing in our centers.