I'm developing an iOS apps and I need to find an easy design tool, something that would allow me to drag widgets into my GUI, and visually build it.
I'm currently using Adobe Illustrator with this nice kit: http://blogs.adobe.com/jnack/2010/12/illustrator-ipad-sketch-elements.html
But Illustrator is not that straightforward to use. It is a bit too much work to drag the elements, encupsulate them into other elements, resize them, etc. I don't feel very comfortable with it.
Also, I've seen Blueprint for iPad ( http://itunes.apple.com/us/app/blueprint ) which seems exactly what I want, but I don't like for 2 reasons:
I can't export the interface in any format beside PDF, and therefore it is difficult to work with designers (pdf, or ai needed).
I would prefer to have a mac app, I think I can be more productive dragging items with mouse and keyboard.