Portable Document Camera for Projector

I was currently at our state's music conference and I went to a seminar where the speaker discussed using a portable document camera for a projector.  He discussed using the camera to project scores, show closeups of instruments, show closeups of particular techniques, and plug in to computer for videos and clips.  After getting ideas of how to use the devise, our music department is considering purchasing one for next year.  You can buy one of the cameras for around $400.  Must click on link and read more about the amazing options it has!