http://www.dvdprofiler.com
Kind of useful program (and its free

). It lets you inventory your DVD collection, but I don't find that part of it that useful actually (easier just to go to the shelf, might be useful in case of fire/theft i guess). What is useful is you can pull up a list of available/recently released/coming soon dvds, do name searches and filter by genre,date,rating and create a wish list of stuff you are interested in getting at some point. It also has a handy price finder feature that will show the prices of your wish list dvds at 10 different on line retailers and highlights what is the cheapest for each dvd. Nothing earthshattering but convient.
P.S.
http://www.bestprices.com seems to have the lowest prices a majority of the time over the other retailers (and is usually pretty close on the items it isn't lowest on). I have ordered a couple times from them and haven't had any problems so far.