I was reminded of the advice to not polish the UI of a prototype too much lest it create inflated expectations (http://headrush.typepad.com/creating_passionate_

I was reminded of the advice to not polish the UI of a prototype too much lest it create inflated expectations (http://headrush.typepad.com/creating_passionate_users/2006/12/dont_make_the_d.html http://headrush.typepad.com/creating_passionate_users/2006/1...). Balsamiq's mockups dramatically use this idea.