It would make me very uncomfortable to call a show from a computer screen; I don't know why, but the thought makes me uneasy. This is my dream of the most efficient, applicable and useful SM software:
Some fantastically brilliant SM geek creates a e-notebook (wireless!!) capable of taking electronic blocking and line notes. Drag and drop style things...tap this, highlight that...the stylus should be designed to look like a pencil in homage to the good ol' days. The menus would, of course, be customizable, say, like, the symbols library in VectorWorks, but of course there could be a starter menu of symbols included. This tablet would be able to print line notes to distribute at the end of rehearsal, or might organize them for e-mailing to the cast. Of course, you would need the script for this endeavor, so...
Another suave and exceedingly charming SM pitches a plan to the Frenchs and the Dramatists and the Whitmarks, et al, to create a subscription based service for e-texts of scripts. An SM, or theatre, would be able to download the e-text of a script into the above tablet. To try to mitigate copyright infringements, there would be a built in expiration date (like trial software) say, a few days after the opening of the show. The suave and charming SM would also suggest to the big publishers that there might be rate packages from which the theatre could choose, to determine how many full printings of the script would be allowed from the tablet. Printing information would be monitored, stored in the tablet and sent back, via the internet, to the publishers, maybe on a weekly basis. Line note printings wouldn't be monitored because the amount of copyrighted text printed in a line note is negligible. Maybe you can only store two scripts in the tablet at any given time. Most of us aren't working on more than two shows at once, anyway.
If any other SMs out there are interested in geeking out on this project, I'm gung ho to see if it can be done. If any other SMs out there are already doing something like this, I'd like to be involved, 'cause I thought of it, too.