The Habari Project has redesigned their site since the release of Habari 0.5. I like it much better than the old design.
Micheal Heilemann, a long time user, designer and developer of WordPress themes (K2, Kubrick) and plugins, has converted Binary Bonsai to Habari with a minimal design and nice typography.
Chris J Davis, another developer/designer who has worked with WordPress in the past (K2, Kubrick, WicketPixie), has also redesigned his Habari driven site. I love the infinite scrolling/non-paged home page; it dynamically loads older content as you scroll to the bottom!