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If you're at a loss as to what Digg stories you might find interesting, or you merely want your Digg account to act more like StumbleUpon, you can check out DiggSuggest. It's a recommendation tool that quite simply leverages the Digg API and offers Digg stories and keywords you might be interested in based on your previous activity.
This isn't a heavily integrated feature with all of your Digg activity, it's merely based on the stories you've already Dugg, notes Webware. The good thing about this is that you won't need to do anything but provide your Digg username, or even someone else's Digg username.
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DiggSuggest is quick to point out its beta status, and the actual page layout of its service very much reflects this, but so far DiggSuggest is off to a decent start. Perhaps a browser plug-in that lets you find interesting content while you're actually on Digg, or even surfing the web, could be a next step for DiggSuggest, or even some shareable stats on Digg rockstars.