Smashing Magazine released the Compositio wordpress theme last month. It was designed by Design Disease. I've converted it to a Drupal 6 theme. It's licensed under a Creative Commons Attribution Share Alike license, the same CC license that Design Disease originally released with the theme. If you use this theme, you must keep the Design Disease link and my link in the footer of the theme.
I took some "drupal" liberties with the theme. Since Drupal blocks can be ordered in whatever order the administrator wants to order them, the right side blocks' styling will maintain its color cascade instead of being fixed to a particular order as in the original theme.. The search box is fixed at the top. The new comment form's styling is a little different, too, with the labels being lined vertically with the input boxes instead of horizontally. I fixed an IE6 dropdown rendering issue just for fun.
Leave any bug reports or feature requests in the comments and I'll address them if I can.
Download the theme:
You will still need to download the original Wordpress version if you want the logo's PSD file.
Smashing Magazine announcement:
Compositio: Clean, Beautiful and Free WordPress Theme
Design Disease announcement:
Design Disease portfolio post: