In Austin?! There are a lot of really fine pubs, bars and "bar and grill"s around here. if you went to the infamous 6th street looking for one though, I'm sure you did come up short.
North of downtown is The Flying Saucer with something like a 100 beers on tap... I've never been there but hear it's pretty cool. Very popular among the beer set.
I don't have to go far because in my neighborhood there are two pubs within walking/biking distance; Taps and The Dig Pub. Both have a good selection. Taps has better food and their beer selection is 30 taps and even more bottles but they have fairly common items, still plenty of micros and crafts. The Dig Pub is more esoteric with a more limited selection, almost all on tap (20, maybe more) but all handcrafted brews for the serious beer afecionado.
There are many others but they are out in the neighborhoods, not in the city.
Others shoul dbe able to chime in about what is close to them.