Having a window.onError hook that logs the traces to your backend can really help you debugging clientside stuff like this! :) Also i can recommend logging (at

Having a window.onError hook that logs the traces to your backend can really help you debugging clientside stuff like this! :) Also i can recommend logging (at least during your demo phase) a complete click-trhough of what your users are doing so you can reproduce it at will, using for instance http://www.clicktale.com/ http://www.clicktale.com/