The billboard seems to have worked great. The meetup.com site has gotten over 50 new members since the billboard when up, and tonight's meet up was one of the largest we've had with about 43 people showing up. Hopefully next months will be just as high if not higher. If you missed this month's meetup there are still plenty of other events scheduled, and we'll be back at the usual spot the 3rd Monday of every month.
Check out http://www.meetup.com/cincinnatiatheists/
for more events.