Slock.it is a really cool Blockchain start up that is producing locks that open when digital currencies are sent to them! They have working prototypes and have a very cool crowd sale format: They are creating a for-profit DAO that will control the funds raised and employ Slock.it to produce the Slocks and can fire them as well!
https://www.youtube.com/watch?v=49wHQoJxYPo&t=0m5s
Check them out and if you want to participate in building the worlds first real DAO, get on their mailing list at http://Slock.it and they will send you an email to join their Slack (the workspace where the conversation is happening).