Digg released its official iPhone app this morning, and after playing with it for a little while, I can tell you that it does what it says on the box: it will let you browse, interact, and comment on the popular news aggregator without many problems (there was one major issue -- I'll mention it in a second). However, in general, the app isn't all that different from the interface they released a while back. Sure, there are a few app-y touches, but mostly the app just feels like a Digg-specific browser. I suppose that's what they were going for.
The app works pretty easily -- you can dive in and view the top, recent, or upcoming stories in any of Digg's categories, and clicking on each headline sends you to an in-app browser with the page displayed (as best it can be -- of course Flash movies don't work, and lots of the really popular links on Digg are murdered via bandwidth already). At the bottom of each page, you'll find buttons to like or dislike the story (sorry, Digg or Bury), a button to save the story if you're logged in to your Digg account, and the option to share the link. When you select the share option, you can send it off to the iPhone's clipboard, Twitter, Facebook, or Email.