Hey all, with installing of Developer Preview of Visual Studio 2011 you will find new component called PowerPoint Storyboarding. this is an amazing tool which you can use to make a nice, very easy and professionally looking mock ups

As you can see in the below picture, you have a lot of shapes on the right to use, beside the normal shapes and full features you are custom to it in Power point 2010

This is really an amazing tool, that I believe will be used a lot

Also here is an interview video with Justin Marks talking about story boarding