Keynote Kung-Fu enables you to use Keynote to create wireframes and clickable prototypes for the web and mobile devices. Keynote Kung-Fu includes dozens of templates for Keynote ‘09, Keynote for iPad, and Microsoft PowerPoint.

What makes Keynote such a great prototyping tool?

No need to learn a complex design tool. You already know Keynote (and it's probably on your Mac or iPad already).

It supports all the fidelity you need without adding complexity to your worlflow.

Links, animation, actions, and transitions give you the power to interactively tell a story with your designs.