<shameless self promotion> I use goaloc ( http://github.com/mattknox/goaloc http://github.com/mattknox/goaloc ) for rapid prototyping-it allows me to blow smart

<shameless self promotion> I use goaloc ( http://github.com/mattknox/goaloc http://github.com/mattknox/goaloc ) for rapid prototyping-it allows me to blow smart scaffolds out into rails code, which I then style. Usually, this gives me about the level of functionality I need for clickable prototypes. That said, I often prototype on paper, too.