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Looks like all these links are taking you to Google Base. If you do a Author: L3DG search at BlogSearch, you notice it brings back the result from the SERPs above. This is looking like some sort of source detail, added to the SERPs, which is pretty cool. Still a bit foggy on what exactly is going on here, but thought I would post it anyway. This does seem a bit different then what we reported on early today, Google Testing Refinement or Clustering Filter Links.
Forum thread at Search Engine Roundtable Forums.