Are there any products or tools for managing this kind of thing?

I generally want my lists of books/films/music playlists whatever that I've seen, reviewed or marked as "to watch" to be managed seperately from any one particular vendor, and owned by me.

There seems to be some movement towards this with e.g. smart TVs that will search all your apps for shows, and sites that will tell you where a specific film or show is available, but I've not seen anything either super geeky, or super easy to use.