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Infinite Display control the projectors in the Student Center, Stata, and the Infinite. They don't usually do ad swaps, but it might not be a bad idea to ask them for one anyway. Look at their slide for specs. It should be a full color widescreeen image. Student groups get 3 days of free Infinite Display space per semester. See here for details. It's only $15/day – we should probably start doing this again.
Spam is your friend. People will probably reply to you complaining, but not that many. You'll also get some bouncing emails and "away from office" emails. but it's totally worth it.
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Sidenote: the theatre arts mailing lists change often. Keep track of them. Currently, they are: ta-performances, ta-auditions, ta-crew, and ta-academic. In case it's not clear, these are, in the following order: show publicity, auditions announcements, techies wanted, and academic stuff within the department. Don't misuse them, otherwise the theatre lady will yell at you. These have changed twice during my time at MIT. These might change in the future 
A sample Email blurb: (include that nifty banner your pub designer made!)
The MIT Shakespeare Ensemble presents
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Our last performance is tonight!
Reserve Tickets at http://webensemble.mit.edu/ensemble/www/tickets/
Magic and mischief abound when the Queen of Naples and her court find themselves mysteriously shipwrecked on a deserted island. Join us for a night filled with sorcery, alcohol-inspired homicidal plotting, and young lust.
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