i like http://www.amazon.com/Agile-Software-Development-Cooperative... (cockburn's cooperative game), but i am not sure if it's suitable for a library.

i guess what i mean is, that i think it's a great book for a developer. but it's not very prescriptive, so may not be great for teaching. it's more about trying to get you to think than telling you what to do. imho.

http://www.amazon.com/Agile-Software-Development-Cooperative...

http://alistair.cockburn.us/