I was doing a little surfing today and found this cool free app…
Mouse Mischief can transform teaching and learning in the classroom. Mouse Mischief integrates into Microsoft PowerPoint 2010 and Microsoft Office PowerPoint 2007, allowing teachers to create interactive presentations that engage and excite every student in the classroom. Approximately 525 students, each with his or her own mouse, can answer multiple choice questions and draw on a shared screen. You can download Mouse Mischief free of charge.
So have a PC add USB HUB and lots of mice and now your PowerPoint’s become active with students interacting with the instructor
Mouse Mischief is an add-in for Microsoft PowerPoint 2010 and Microsoft Office PowerPoint 2007 that allows teachers to create and play multiple-mouse lessons that students interact with on a single display, individually or in teams, by using their own mice.
This bring interactivity to the students with out them having computers and you can control the classroom.