Zen Deck was created when building Rich Deck as a generic card viewer. Whenever you build a feature you can often make a tool so other people can build the same type of feature. Zen Deck was modified quite heavily for Rich Deck but the core still stayed generic. Zen Deck is used for the current main interface for Dan Zen.
Zen Deck reads in an XML configuration and data file. It is fairly customizable in terms of colors and content. The layout and functionality is rigid. You can download the zip file with all you need to set up a Zen Deck feature of your own. See the “About” link in Zen Deck for the download link.