I would like you to create a PHP version of: http://www.delicious-monster.com/ for corporate environments.
No need for the fancy features, but barcode scanning and auto cover-image-retrieval should be available.
Admins can check-in check out books/cd/dvd, normal users can check availability and make reservations. Centralized mysql database, I would say...
As it needs to run in a corporate env, LDAP security is a must have.
Above all, it needs to look awesome and be very usable.