I have about 400 DVDs. How do I keep track of them all? I used to use my brain. I still know every DVD that we have, but the other 5 members of the household have no clue what's on the shelf. To solve that issue, I downloaded iCollect Movies from Hooked In Motion, LLC. ($2.99)
Basically, grab your DVDs (or BluRays), Barcode Scan them, and Viola, you have a beautiful list of your collection.