https://github.com/basho/riak_cs
If any experts happen to notice particularly good or heinous examples in this source code, it'd be interesting to point them out.
- Conf info: ricon.io/east.html - Tickets: http://ricon-east-2013.eventbrite.com/
Riak CS doesn't use any Riak functionality you can't use yourself, so accessing Riak CS-created chunks is easy because that's what Riak CS itself does. The source for how this works is at https://github.com/basho/riak_cs/tree/develop/src in case you want to play and have fun with that.
Awesome to see use of vagrant to get started quickly!