Balsamiq is a sweet tool, congratulations! In my view the missing link is interactivity… . especially when trying to present new functionality.
For instance, I would like to be able to show navigation all within one screen. Taking the mock-up to a ‘usable’ and living mock-up. I know it is possible to add a URL but then this leaves the Mock-up, not very fluid.
How do you fine people do this now; print outs on board, mock-up of mock-ups, … ?