DVDCrate.com

DvdCrate.com is an online organizer to help you track your collection of movie related media discs (including: Dvd's, Blu-Ray, HD-DVD, DVD-Audio, UMD, LaserDisc and VideoCD).
You can track your purchasing history (including custom titles, purchase place, amount paid).
Create lists (DvdCrate calls lists "Crates", mostly to be cute) like disc you own, that you have ordered, that you have viewed, loaned out and that you would like to own (wishlist).
Loan information includes the ability to send reminder emails to the loanee, keeps track of when you loaned it out and when the loans are due back.
Print your Crates with nice clean clutter free formats.

Have a public profile that lets others see your Crates (you can also turn this off if your the shy type)
View statistics on your collection (you can view site stats here), find out who your favorite actor really is or your most liked Genre.
Enter in reviews of Discs you have watched and see what others thought.
Email people a Crates; including your Wishlist of Discs that they can purchase as gifts.

Want to see it do something else? Great! Submit a feature request, development is always going on.