The I-Prompt?

In the course of dishing about  the "going-up" shenanigans of certain stage stars, Michael Riedel posits a new use for new technology:

Producers foresee a time when actors will be able to hold a little something in the palm of their hand that will flash their lines. Or perhaps they can steal a glance at their watches, in character of course, and get the line.

Finally, something useful the theatre can do with these gadgets!