I am so addicted to
DVD Aficionado. It is such a simple basic site, but it is a pretty fun way to catalog your DVD Collection. You make a free account, go to Quick Import under the My DVDs tab, put in what titles you have, choose the appropriate versions of each title, and put those on your owned list.
You can also make a wishlist of what DVDs you want... I got most of my friends and family to try the site before Christmas so it made my Christmas shopping rather easy. ^_^
My own DVD Owned List. ^_^