Here are some articles I've written for Campus Technology that relate to portfolios:

http://campustechnology.com/articles/2009/11/01/eportfolios.aspx?sc_lang=en
http://campustechnology.com/articles/2009/05/20/why-eportfolio-is-the-tool-of-the-time-and-who-is-enaaeebling-it.aspx?sc_lang=en
http://campustechnology.com/articles/2010/01/06/eportfolios-let-me-count-the-ways.aspx?sc_lang=en
http://campustechnology.com/articles/2010/02/03/as-we-may-learn-revisiting-bush.aspx?sc_lang=en
http://campustechnology.com/articles/2010/02/17/the-higher-education-hedgehog.aspx?sc_lang=en
http://campustechnology.com/articles/2010/03/03/jobs-for-graduates-in-the-knowledge-economy.aspx

And, here is the list of all of the articles I've written for Campus Technology over the years:

http://campustechnology.com/Forms/Search-Results.aspx?query=Trent%20Batson&collection=CT_Web&Page=7

A PowerPoint, March, 2010, "ePortfolio Briefing":

http://www.slideshare.net/trentbatson