If you're ever down southwest in the Oak Hill area you may want to try Flip's Satellite Cafe. It's in the strip center at 290 and 71, next to Big Lots. They have veggie breakfast tacos, veggie wraps, portobelo sandwiches, and many other options including with tofu. They also do decent chicken and steak meals for non-vegetarians.
Singlemalt, I believe you're thinking of Madras Pavillion (on the NE corner of Burnet and 183). Love those dosas!
Most restaurants in Austin are quite vegetarian-friendly (with more than just veggie burgers available). I think there was a good thread about this very subject a few months ago. I'll try to find it.
As a vegetarian, I love these places:
Tacodeli (every vegetarain taco or plate I've had there has been great
)Ruby's BBQ (black bean and cilantro tacos)
East Side Cafe
Galaxy Cafe (lots of wraps and *ahem* veggie burgers and sweet potato fries)
Little Deli (try the vegetarian sandwich!)
Arturo's (Thai veggie sandwich)
Hyde Park Grill (lentil soup, a few sandwiches, and those fries)
Also, if you do just want a veggie burger, Phil's Icehouse makes veggie versions of all their burgers.
Ditto for Dog Almighty (except that their medium is the hot dog).
I am veggie but my husband is not but we both really like all the options at Magnolia Cafe. I love the Tony Burger with a veg patty--it is the most amazing veggie burger I have had anywhere-- and I eat a lot of them all over the country. Great for breakfast too.