http://del.icio.us/avcr
It's very easy to update and organize, doesn't take up any physical space, and is accessible from any computer with an Internet connection. Each staff member in the children's department has bookmarked our del.icio.us account, and I've shared the url with the adult reference staff as well, just in case they ever get stumped by a children's reference question. So far, it's been very useful!
