Suggestions for creative use of post format feature, or themes that use them well

I’m looking for themes or examples of sites that use the post format feature in an interesting way.

I suppose adding special styling for each post format would be a good start. But if anyone knows of it being used in a cool or creative ways by a premium or free theme feel free to chime in.

Check out this post on WordCast:
WordPress Post Format Eye-Candy: Tumblr Style Theme Inspiration Showcase

Also Digging into WordPress uses them and just wrote a post about it:
Tumblr Links with Post Formats