This list looks pretty nifty (concerning the 60's): http://comps.soybomb.com/compsproject/location.php?&lifilter=4&sLocation=texas&litype=2&ssearch=1&lispeed=1

An then here's a small piece on texas scene in '90-'95 (if you scroll down a bit): http://www.scaruffi.com/history/cpt53.html

Some recent one's: Book Of Shadows, Carlton Crutcher's (formerly of ST 37) droney experimental 'band'. Rrreverberationsss (whose 'Music For Psychedelic People' was played almost(?) entirely on one of the 'Tue'sday Night/Wodnesday Morning shows, btw..). Also, i think Heather Leigh Murray was born in Austin...