Last year, I saw an idea on http://countingcoconuts.blogspot.com/2011/11/our-school-library.html that peaked my interest. Tonight, while my hubby did dishes, I FINALLY dug in. It's taking a bit to sort through all the books we've collected over the past several years, but progress is being made. And, it's not as overwhelming as I thought. Color coded stickers make it quick and easy to organize, find and replace books.
Project bonus: Knowing which categories are sufficient and which are lacking.