Posting #762 from "Tomorrow's Professor" listserv (a good overview)
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Inter/National Coalition for Electronic Portfolio Research
A listing of Educause articles on e-portfolios
The Wikipedia entry on e-portfolios
Taskstream, Inc. - Used by the School of Education at URI: Electronic portfolio project at the University of Rhode Island
(This page has links to publications related to their product(s) as well as their tools/products)