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Pen and paper. In my experience these make it much easier to quickly show your mockups to people.

Balsamiq - Not free but, IMHO, it's the best out there.

I have used Balsamiq, I like it but it lacks some features that I think are very important. You can't create a component for reuse or any "Master Pages", so if you have common parts used in many screens and you have to change some of these parts you have to repeat the changes in every screen. Also there are no projects. If Balsamiq implemented those 2 things I would be delighted. Meanwhile I'm trying ForeUI.

For symbols, see http://balsamiq.com/support/documentation/symbols

For projects, we're working on them (they work on http://balsamiq.com/products/mockups/mybalsamiq for now). In the meantime, see http://balsamiq.com/support/tutorials/projects

HTH! :)

Mmmmm thanks! That makes Balsamiq a lot more useful!!!

pencil http://pencil.evolus.vn/en-US/Home.aspx

Recommended wireframing tools?