This looks like a great tool for creating interaction and adding multimedia to PDF content. Free for materials up to 500 page.
ActiveTextbook | Interactive Textbook Software from Evident Point
Turn your vision into reality by creating your own version of an existing PDF or textbook. Give it a dynamic touch, jot down notes, add video/audio clips, and discuss materials with your readers within your interactive content. Use Active Textbook to learn, teach or simply share your documents online – it's easy!
Phi Beta Iota: This has huge potential for “just in time” education and for the advancement of Standard Operating Procedures and all forms of organizational handbooks, manuals, regulations, etcetera.
