I don't have a single peer using Windows either. As a fellow escapee of the windows world you may be interested in a (non-flash) alternative to balsamiq called

I don't have a single peer using Windows either. As a fellow escapee of the windows world you may be interested in a (non-flash) alternative to balsamiq called Mockingbird (http://gomockingbird.com/ http://gomockingbird.com/). It uses the Cappuccino framework (so that's 'Objective-J') like 280slides -- that means you'll need Firefox 3.6 or Chrome probably, but I know you're already on top of that :)