I use blu-ray.com quite a lot for info on the quality of various blu-ray releases. It seems they released an app recently into which you can scan your films and basically keep a library of them and link into the website. The app uses a barcode scanner which you can use to add your movies or you could use it to scan a blu-ray cover when in-store and check what the website says about the release, or if you even have already bought the movie!
I sometimes get a weee bit fuzzy on whether or not I already have a movie on blu-ray, mainly because it's the third time I have bought some of them (VHS, then DVD, now blu-ray), so this little app seems to be useful to me!
Works well on Android (I've not tried the Apple flavour).