trza asked me to post a review of the Isis show at the Ridglea Theater, which was earlier tonight.
Short version: Totally. Fucking. Awesome.
Intronaut and Torche were the openers- both played about 45 minutes. I liked Torche a bit better; they're sort of a harder version of old Black Sabbath (particularly around the Sabbath Bloody Sabbath era) while Intronaut reminded me of early Isis, with a bit more emphasis on the hardcore/thrash elements.
Isis played about 75 minutes; here's the set list, so you know what to expect if you see them in Austin:
Wrists of Kings
Not In Rivers, But In Drops
All Out of Time, All Into Space
If you can make it to the show at Emo's (I think it's later today, the 28th) I highly recommend it.