Sarah Silverman, Sutton Foster, Jason Sudeikis from SNL (I think), some of the comedians from 30 Rock, and I'm probably missing a few more.

Title of Show looks like it would be a fun show, but I'm confused as to why they went Broadway with it. They would have done so well Off-Broadway considering how many inside theater jokes the show contains. It just wasn't a tourist type of show and it's already canceled. But I love Vineyard Theater and they usually pull off quality work!