"Any medium powerful enough to extend man's reach is powerful enough to topple his world. To get the medium's magic to work for one's aims rather than against them is to attain literacy."
-- Alan Kay, "Computer Software", Scientific American, September 1984
The structure of Omeka is beautiful from a user standpoint, with one thing missing to make it more useful for e-portfolios or my particular idea (scholars contributing primary-source notes for a subject-oriented document collection): a place for discussion of provenance and vetting/authenticity.