Tacos South Austin?
I do have a comprehensive list, but the south side, west of I-35, is outside my current field of operation. However, did you see these threads?
I thought they might help get you started. If you find something good on your own, just by chowhounding around, please let us know.
I love the al pastor @alpastor next to the RR tracks S of Ben White.(after 8pm) The barbocoa @ Chilangos is moist and fatty. And that is on the corner of Stassney and Congress(I believe) and right next to the Benjamin Moore Paint Store. I was looking for 2 t'day just north of Slaughter that have been there a while but were no longer.