In case you haven't heard: the Bartik theme is now in core and, after some refinement, will be the default theme for Drupal 7. This is thanks to the phenomenal effort of many contributors from around the world.

I've been happy to help out on Bartik over the past several months and have worked quite a bit on improving the core color module's usefulness to themers who want recolorable themes. Tonight I gave an impromptu talk to the NYC Drupal user group about D7's color.module and Bartik.