Portfolios, not only ePortfolios are good way of combining different challenges. In genereral the point of view of the learner, seeing his/her process of learning and the instructor, who needs the resuts for judging (grading) and planing other courses.
If you want to go beyond the level of the texts only eportfolios are a good deal. But the format, the electronic form, doesn't make the contend alone. ePortfolios can be an advantage for integrating audio, pictures and videos, for creating a picture with wider aspects. But relying on the form alone is difficult. Creating ePortfolios should also integrate the students, that are not that computer-literate, for this the combination of (traditional) portfolios and ePortfolios seems to me, an language lecturer in Asia (Japan), an appropriate way. Not all of my students are sure in the field of internet and computer, and the question what language is to use, don't make it easier. But portfolios, yes! And the most useful categories for filling the documents arn't yet dicided.