As part of my university's LMS investigations, we are also looking at eportfolio software.
I recently had a look at Mahara and was very impressed with its functionality.
You can develop your own eportfolio on their Demo site.
Mahara is open source code and offers users the ability to progressively add artifacts and evidence with the opportunity to provide customised views to those you wish to see your work.
Very cool and well developed--get yourself an account and try it out.