Passbook-ruby gem for Rails
I’m sure many of you are aware of the new Passbook app that came with iOS6. It is a very convenient and centralized way to keep all of your cards and passes in one spot. Passes can be updated by the vendor in case anything changes (ie. gate number, point balance). Passes can also be associated with your existing app.
Read More - http://www.xtremelabs.com/