Theme update? No way!

Indeed.

Thanks in large part to zen these things have been overhauled!

nista - http://www.drupal.org/project/nista
cleanstate - http://www.drupal.org/project/cleanstate
simpla - http://www.drupal.org/project/simpla
splender - http://www.drupal.org/project/splender
spooner - http://www.drupal.org/project/spooner

All are available in fixed and liquid widths. Most importantly, as subthemes of Zen, they require you install Zen first!