DVD Cache 0.49 (178Kb freeware) looks to be a useful little application. Type in the name of a DVD and it looks up relevant info from the Internet Movie Database (imdb). Handy for keeping information about DVDs you own. It even has an area which picks up names from your Address Book so you can keep track of who you’ve loaned your DVDs to.
I actually use Readerware to keep track of my books, CDs, DVDs and videos but DVD Cache is worth looking at if you have some DVDs and would like to keep track of them.