Matt Mullenweg (the man behind Wordpress) says in a conversation:
The next version of Drupal is coming out with a pretty neat theme, called Garland. Here's a demo page where you can customize it and save you changes:
http://acko.net/garland/?q=admin/build/themes/settings/garland
This is pretty darn neat. Anyone interested in porting it? The toggle, logo, and shortcut icon bits are probably superfluous, but the color picking functionality is great.
As far as I know, this is the first time that a Drupal theme is ported to Wordpress. There is the feeling of some bad taste in the Drupal community about this port being done before Drupal was able to release this in Drupal 5 though. This still is a historical step in my opinion.
Port to be released after Drupal 5
From http://drupal.org/node/103007:
Many felt that having thousands of WordPress sites using the default theme of Drupal 5 before its release, would take away from the impact Drupal 5 would make.
Fortunately, the WordPress developers reconsidered. In the words of Matthew Mullenweg, the lead developer of WordPress:
WP.com is going to disable the theme for new users at the request of core members of the Drupal community.
Garland for WordPress will be made available once again after the Drupal 5 release.
I'd like to thank Matt once again for his decision and hope many WordPress users will enjoy Garland later this year (?) as much as our users enjoy the many WordPress theme ports on Drupal.