They have a place outside of Austin in Dripping Springs called "Salt Lick" which is supposedly very famous, though maybe I'm just used to it. Its on a ranch in the middle nowhere, and you get all you can eat ribs, brisket, sausage, bread, cole slaw, and potato salad you can fit in your tummy. The only rules are that you have to try and eat all the meat off your ribs, and be out of the restaurant in like 2 hours or something...I guess so people don't camp out in there haha. plus its BYOB!!!
Other than that, they have this like Ruby's BBQ thats a tiny little place that a bunch of famous folks have been to over the years...good stuff...they also make a mean Jambalya