As i am elaborating in my thesis, education institutions are not exploiting the potentials to aggregate relevance the same way financial institutions are doing[1]. So here is one idea that identifies an opportunity to aggregate relevance of professors:
Build a tagging service like del.icio.us (or collabroate with them) that allows for filtering and synergizing relevance in respect to the source of the tag's author. By building exclusive academic tagging networks the quality of the information refferred to is to a certain degree 'guaranteed' and if the network
This idea would be one way "to share the knowledge of the university" as Julia Minguillon pointed out is the key mandate (formulated in the web 2.0 fashion) of educational institutions.
UPDATE: I just found an interesting service that aims pretty much at what i am thinking about: http://edtags.org/ (is a Harvard related initiative)
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[1] This is a theme i have found in Sasskia Sassen's work - she compares the exploitation of digitization by financial organisation with civil society organisations.