There are many Digg-like WordPress themes like this and this. None of them are really like Digg (Digg layout and styles) but this one, made by VCARS is damn real!
Digg items are posts. The Digg top right ad is replaced with Youtube video. Digg icon become post date, the thumbnail become post’s thumbnail. It is integrated with Flickr photo stream and much more with the help of additional plugins.

[The real Digg theme]
It’s perfect for any blogger who’s a Digg enthusiast, or for anyone who simply wants a professional looking blog that looks like Digg.

[Digg theme: The post with thumbnail (sorry, you can digg it)]
Check the preview here. Download, step-by-step installation, plugins integration and tutorial on how to create a logo ala Digg are available from the homepage.
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