I can't figure it out. When I open passbook, it just shows me a link to the app store. And I have some passbook apps but I can't figure out how to do anything with them in passbook. I like the idea, but they need to work on usability.
Yeah, Passbook isn't the "entry point" for acquiring content, it's pushed through apps (and remote services). So most apps that support it, also duplicate the core function of generating the 2D barcode.
It's really just an interface/API for aggregating passes into a single location, keeping the UI/UX consistent and providing extra services like geolocation awareness.