Ran across them doing some random zoo searching: Zoo With Us Zoo Reviews - Zoo With Us http://www.thezooreview.org/ They're both websites with a bunch of U.S. zoo reviews, zoowithus mostly in the Midwest some of the Southeast U.S. and zooreview mostly in the Southwest and Great Plains area.
I have not heard of either one until now. I took a quick look at each and they are nice little sites detailing their personal travels. Of course they are nowhere near the same league as ZooChat and they would only be helpful if the people who run the sites happened to have visited a zoo you are interested in visiting.