This book outlet is perfect for zine-geeks and artsy people alike. There are unique trinkets and awesome design posters. If you're visiting Austin and want to take back souvenirs, consider Domy.
This is the most interesting bookstore in Austin.
A true reflection of Austin's unique spirit. During SXSW, head by for KXLU and the Smell for the "What by Whatever" 2012 Showcase. More info on do512.com!
Awesome Kid Robot selection.
Domy has an awesome art installation that depicts Jack The Ripper's final murder scene. Pretty graphic (i.e. don't take your kids there).