Awhile back, I posted about a great book called "The Read-Aloud Handbook" by Jim Trelease. In the book, he recommends that books be stored with the cover facing out, b/c they are more appealing to kids that way. The old-school, library way of storing them on shelves with the spines facing out does not draw kids to the books b/c they cannot see the picture on the front.
One of the suggestions he gives is to use rain gutter. It sounds odd, but hear me out. For a teacher, the space under the chalkboard is usually a waste. But put a strip of rain gutter there, and its an instant book shelf.
We decided to use rain gutter for storage in Andrew's room. There are many fancy book holders out there, but they are large bulky pieces of furniture and cost a lot sometimes. I was really pleased with how the rain gutter works, and Andrew loves putting his books away. Plus, I think it cost us less than $10. Awesome!