The Austin (Zen Sub theme) was created in partnership with Mark Boulton for the "Iron Chef" style competition at SXSW 2009. The competition known as "Ultimate Showdown of Content Management System Destiny" brought 3 CMSs (Drupal, Wordpress and Joomla!) together to build the same site and the same theme in each platform, and then share all the hard work back with our communities.
The sxsw project can be followed here: http://cmsshowdown.com/drupal and the site and its theme + modules will be available for download there soon.
The Austin theme is a typographically driven theme, designed by Mark Boulton.
If you're new to Zen, check out these reference cards!
Note that this theme may not be the best admin theme due to the widths of tables, etc. Patches are welcome.