So those are the issues in K-12 schools. I'm not sure electronic portfolios will work well in elementary schools until we get systems that are BOTH easy to use and allow student creativity in presentation, something that doesn't exist today. I've often said that e-portfolios will only happen if elementary teachers have partners in the process, either parent involvement or older students to assist the younger students to digitize their work, and to upload it to a program.
I guess my question to you really focuses on WHY you want to implement portfolios in elementary schools. If it is to support student learning more about themselves through a reflective process, I am 110% behind you. But if it is for large scale assessment, for purposes of reporting to external audiences (primarily administrators, politicians and the general public), or quantified just like traditional testing, then I am not as supportive. I think high stakes accountability is killing portfolios for learning. I also think teacher education programs who are only creating accountability portfolios are "poisoning the well" by turning off a whole generation of teacher candidates to using portfolios with their own students. I have anecdotal evidence that students who create these Teacher Ed portfolios don't know how to create learning portfolios with their own students. That tells me that there is no authenticity in the accreditation/accountability portfolio process.