Creating a loan library site using Drupal is straight forward since lot of modules that can helps us to creating that. We can use popular modules like Views, CCK, Content Access, Date, and Rules. But if you want more simple solutions (no need to configuring lot of settings), you can use Library module.
I already try the Library module on client site and it work great, yes even the module only have the development release. With the use of Views and CCK, the loan library site can easily created to meet the client needs.
Visit the module project page to learn more about the Library module.