I just stumbled across this while reading our local paper, the Austin American Statesman, this summer. This sounds so cool and there is a special for TONIGHT (buy one get one free)!! August 11, 2011! There is a Promo code of : august 11 to use at their website http://www.austineatsfoodtours.com/
They offer a walking tours of their favorite places downtown and on South Congress. They typically hit six to eight restaurants.
Hope you try it!