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Personal Portfolio of Web Metadata

Today's Research Question

How do we extract metadata (RSS, FOAF, RDF) from webpages and web objects (such as PDF files, JPEG images, PowerPoint slides) and store them somewhere to build a personal portfolio some part of which could be shared to the others by means of the social web?
This could enhance personal knowledge management experience and, from the social effect, could also expand individuals' knowledge by sharing parts of their portfolios with the group of people having the same interests.

There are a number of interesting projects that could somehow be integrated and developed to achieve this. To me, given the popularity and content-richness of del.icio.us and the innovative browser integration of Piggy Bank, these projects are currently two outstanding candidates.

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