Erica and Dan from Cincinnati Re-Adventure have put together a great few posts highlighting some of Cincinnati/Hamilton County Public Library's branch locations, plus the Mercantine Library. I haven't visited a number of these branches, so it was neat to see how each of them focuses on the needs of their patrons. It is really quite a customizable system. Strangely enough, I actually saw them while they were touring the Mercantile Library. I was, of course, too shy to say hello. Perhaps next time?
Without further adieu:
Main Branch and the Mercantile Library
While you're there, check out the rest of their stuff. They do a really great job. Cincinnati Re-Adventure was one of the first blogs I found when I moved to Cincinnati and their posts were extremely helpful for finding things to do around the city.