http://www.visitomaha.com/craftbrew is where you can get a passport to a bunch of free beer. Seriously, one free beer per stop.
I'm writing this as of August 27th 2015. So if it's well beyond that, YMMV and things may have changed.
I've written many of these guides over the years. I decided I would keep one and share it out when needed since people seem to appreciate it, and it’s a subject I enjoy writing about. If you have any suggestions or comments, drop me an email. If you want to complain about a certain establishment, keep it to yourself, or review the place somewhere online. Going to try to keep this neutral, however if I know a lot of people in the local beer community who don’t like a place, I will mention it. Again, this is all my opinion. Objects in mirror may be closer than they appear. Your mileage may vary.
Ah, grey areas. Let’s just say this is my personal advice to you, the reader. If you like Granite City (I actually do on occasion), go. It’s just not unique to Omaha. This is a guide for people who are new to town, or wanting to expand their cultural awareness of their own town. If I don't feel it’s worth visiting, especially with all the other options available I won't mention it. Just the way it is. If you like Old Chicago, or are the less adventurous type, the Old Chicago on Cass is the best one in town. BW3 sucks everywhere, however.
I’ll have to go with Blackstone District and the attached bars and Benson. If you want to throw in a third or see a really cool place, you really should go to the Homy Inn and have some champagne on tap.
Overall, if you just want to try a bunch of local beers, hit up Local, which is down near the Old Market just south of the CenturyLink Center.