Here are a few resource links to help set up ePortfolios with your students:

ePortfolio References:

What are ePortfolios?
EDUCAUSE: An Overview of ePortfolios and How to Use Them
Videos of teachers and students talking about ePortfolios
The Influence of portfolio media on student perceptions (paper)

Tools and How to Use Them:

How to explanation for using Google Sites
Sample Google site ePortfolio

How-to explanation for using Netvibes
Sample Netvibes ePortfolio

A Few Sample ePortfolios:
Kimberly Bassler
Kevin Gilmore