Add "Chunk" Theme to the Commons
A pretty nice, clean theme for wp.com that looks to be available here . This is the theme that kfitz chose for her revamped blog.
Seems a bit strange to me that it's available on Trac but not part of the official wp.org/themes repository; do you know why that's so? It appears to have been developed by Automattic for wp.com; perhaps they don't share their themes?