http://www.creativetechs.com/iq/make_a_pdf_portfolio_with_interactive_rollovers.html

Make a PDF portfolio with interactive rollovers.

This week's creative tip is inspired by a question on how to create an interactive PDF for showing off before/after examples of Photoshop retouching projects.

The technique itself may apply to a limited number of people, but it is a fun way to introduce some of InDesign's lesser known interactive features.

This tip includes a quick tutorial on how to build interactive rollovers into your next PDF. The tutorial includes a sample file you can download to try out yourself.