If you're organizing a show, put up a craigslist post (or get someone to do it for you). You would be amazed at the amount of people you can get with a well-timed, good-looking, well-written
craigslist post.
My biggest publicity recommendations are craigslist, mailing lists (keep an email list of your fans and email them about upcoming shows), and signs (if you can, get the venue to put up a sandwich board that says "Improv Comedy," time and date, and any other details you want to put in)...
and having a nice website to send people to at the end of all these other things.
If anyone wants to utilize craigslist and has questions, wants advice, or needs to know how to write code, embed photos, or make links, I am happy to help. PM me through IRC or send an email to
rarebirdshow.