It is no secret that many folks are simply scared of public speaking. Practice can help with that. Devices such as Google GLASS can be quite helpful for public speaking students. Researchers from the Human-Computer Interaction Group at the University of Rochester have developed Rhema to help folks improve their presentation skills. Smartglasses with Rhema installed can record a speaker, gather data to analyze the volume and speaking rate, and provide the speaker with real-time feedback.
Such a solution could help public presenters improve their delivery. You can find out more about it here.