Jeph, I don't think "releasing" a poster before a show is a problem, after all, they are advertisements. Selling the posters before the show is different.... here is the discussion from a month or so ago: http://www.gigposters.com/phpBB/viewtopic.php?t=2000&highlight=show+selling
Oh man, just got back from this show and Bad Wizard rocked so hard! My ears are still ringing. Has anyone seen the t-shirts they have on this tour, the doggy-style sihlouette? Inredible! Yeah yeah... I posted the poster before the show. But look at it this way: I was using the posting as promotion for the show, which is what these things are, right?