Thanks all--we managed to hit three breweries today:
Corsair Brewstillery and Taproom. It's adjacent to the Antique Archaeology area, which is an interesting sort of boutique mall. They had about 8 beers on tap. They had a Rye IPA which was aged in a Rye Whiskey barrel. Pretty decent. We also had a nice porter that even my wife liked, and an oatmeal ale that was pretty good. They're actually in the space that Yazoo brewing started in. I'd recommend a visit if you are nearby.
Jackalope Brewing. This is very close to Yazoo, so if you do the one, do the other. The beers were also good--I had a Rompo Red Rye Ale--pretty good. My wife had a Lovebird Strawberry/Raspberry Hefewiesen, which she liked. I thought it was pretty good as well.
Then on to Yazoo brewing. They have tours, and you get a small taster glass that they refill several times during the tour. Had a glass of Dos Perros, a dark lager; it isn't all that distinctive, IMO. Also had a sample of their hefeweisen which I thought was outstanding. The tour was fairly fun, though anyone brewing all-grain isn't going to learn much. Actually, if you're brewing extract you aren't going to learn much either. But it still was fun, there were several samples, and we got to keep the glass.
All of them are worth visiting if you're in town. Wish I had time to visit the others suggested above.