French Caldwell and Alexander Linden of Gartner have collected a number of articles under the banner of PKN and Social Networks Change Knowledge Management
Personal knowledge networking and social networks give individual knowledge workers direct control over the enterprise's intellectual capital and enable a new "grass-roots" approach to knowledge management.
This article is a summary of seven items that require Gartner membership / paid downloads. But the topics all sound familiar: Grass-roots KM, Social network analysis, blogging, RSS, and wiki.
I found this sentence intgeresting in the overview paragraphs: "Interest [in these topics] is also being driven by the realization that KM can happen without a lot of explicit governance."