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The new Digg mobile site isn't necessarily an iPhone app--it just looks cooler on the iPhone than the Blackberry. Upgraded features for Digg's new mobile version include multiple views of popular stories, improved usability for surfing between stories, and faster page loads. You can also add stories to your Favorites while logged in. This new mobile version is designed to operate more like the Web version of Digg, so navigation overall has been improved, specifically the ability to tab between topics and consume more content throughout the site.