DVD Profiler allows you to number them. It automatically puts your titles in alphabetical order. It uses a huge database, and puts a pic of the dvd's cover, lists the actors, director, what audio tracks it has, DVD release date, Disc formats, etc...... it even lists what kind of case it's in. And it's free. Get the software here:
http://www.intervocative.com/Downloads.aspx
Here is a link to my movies, so you can see what it looks like:
http://www.intervocative.com/dvdcollection.aspx/emoxley
There are skins for it too, but I haven't tried them yet.