Here are the links to support the Webinar that is conducted by Dr. Helen Barrett for ISTE on February 18, 2009.

Balancing the Two Faces of ePortfolios
Categories of ePortfolio Tools
My ePortfolio versions
Creating ePortfolios with Web 2.0 Tools
GoogleApps for Education

Dr. Barrett's website: http://electronicportfolios.org/ and blog: http://electronicportfolios.org/blog/
NECC “Bring-Your-Own-Laptop” Pre-Conference Workshop, June 27, 2009
Online Courses: http://electronicportfolios.org/learning/

Read PDF: Assessment for Learning & ePortfolios: What are the formative benefits of ePortfolios? Written by Nick Rate for the New Zealand Ministry of Education in 2008. Excellent reading!