As you might have seen, we have a user Mike Faulkner, who used REALbasic to create a multi-faceted software tele-prompting system for live entertainment performances. It's been used on NBC's Today© show, the Conan O'Brien Show©, The View©, and others, and will be in use during the Superbowl halftime show.
Here is the original Skydancer Studios case study: http://www.realsoftware.com/community/skydancerstudios
So, be sure to catch the halftime show, with Bruce Springsteen and the E Street Band!