Googlios is a very informative site from G. Alex Ambrose that shows how free tools from Google can be used to create ePortfolios.
The site has examples of Googlios, how to get started, tips and ideas, suggested readings, resources and more.
If you are interested in using ePortfolios with your classes, this is a great resource. It's also a great resource if you are looking for ideas to use Google tools with your classes.
