Correspondents have pointed out that Digg has started using RDFa. Going to look I see such things as:
<h3><a href="http://www..." rel="dc:source" property="dc:title">
Headline
</a></h3>
Great stuff!
I got 71 triples from their home page when I tried.

[...] Digg starts using RDFa [...]
17 Apr 2008 at 16:53