We're working on shirts as we speak, I've posted a thread in the announcements forum asking for suggestions, I want to get them ordered ASAP,
Anyway, I haven't done much IRL advertising, though I've done some interviews and been in some regular media, which is always fun, especially since you're reaching a different segment.
Ecomodder will have a booth at hybrid fest, though, and you should all come out and check it out,