Where can I get Blu Ray content?

I have a media center computer setup to my Sony Bravia with 1080p, and I have blu ray movies, and I buy them regularly, but does anyone know how I can turn my movies into some sort of file I can store on my PC, and just archive for easy access through my computer? Or even better yet, some sort of place I can Torrent movies I am unsure of owning, but would like to view in Blu Ray?