Disc Catalog 0.2Free
Disc Catalog is a quick application for those who want to always know what's inside the unlabeled DVDs laying in the house. You may launch the app, and click on "Scan discs". When you enter a disc in your Mac's drive, Disc Catalog will automatically save the list of all contained files, and will automatically eject the drive so you can quickly go on with another disc.
For each disc inserted, Disc Catalog will tell you how you should label it, or you can choose whichever label you want.