Ian Stewart, of Thematic fame, gave a terrific presentation at WordCamp San Francisco about how to use post formats in your WordPress theme. The video is now online and posted over at ThemeShaper.
He’s also made all the slides available to download if you want to save them for later reference.
If you’re looking to make your site more flexible and better able to handle various types of content I highly recommend watching this all the way through. Great stuff.
Post formats significantly changed how I write and made a digital commonplace book possible. If you’re not using them on your site right now you’re really missing out.