Chris Winfield launched a discussion on Digg that's informative and easy to follow, especially for those of you learning about Digg or still warming up to the idea of social media. He describes what Digg is, and goes deeper into how to actually use it, and why. His emphasis isn't strictly marketing. Rather, it's a more natural progression that he describes, of getting to know the place, what it can do, how to "make friends" and what can happen from there.
Questions and additional comments by others, as well as an invitation to suggest more resources, make the discussion productive.
Getting Started With Digg at Cre8asiteforums.