The face cards appear to be rendering as PNG instead of SVG. Additionally, it would be cool to render the flip as a CSS 3d transform transition and fall back to jQuery flippy where not supported.
Also, I'm not sure about the mustache.js + hogan.js + jquery + backbone combo. That's a whole lotta libraries for something that would take around 20 lines in d3.js.
I don't mean this to put you down, but there are different ways of thinking of problems and you are approaching an interface/visualization problem from a templating background (which is possible, but not ideal).
I went with PNG over SVG because I wanted to keep things unfancy until later given that SVG versions are much bigger than PNG versions and I've heard rumors of SVG issues on Mobile Safari. Optional SVG support will likely be added later.
Re unnecessary rigging (hogan.js, jquery, backbone), they're there because this hack was original built as part of a larger project. I'll be tearing them out as time allows because they're definitely not needed.
Re d3 and approaching problem differently, I wholeheartedly agree. I'll be happy to use a 20 line d3.js version if someone comes up with one. :-)
Also, I'm not sure about the mustache.js + hogan.js + jquery + backbone combo. That's a whole lotta libraries for something that would take around 20 lines in d3.js.
I don't mean this to put you down, but there are different ways of thinking of problems and you are approaching an interface/visualization problem from a templating background (which is possible, but not ideal).