When I was at undergrad - portfolio review was a required class for tech theatre majors. When it was my turn to take it, they ran into the stumbling block that I had spent my 4 years stage managing, and while I had plenty of prompt books, I had not much else. What they had me do for the class was clean up two prompt books, one musical and one non-musical, and make a third smaller binder of other things.
When I ended the class I had three matching binders, 2 large ones with the two prompt books, and a smaller 1" one sectioned off into examples of paperwork, some design things I had done and some artwork. It seemed to be a good answer for if I was ever to be asked for a portolio. Of course, its now ten years later and I have yet to take my three nice binders off their shelf - but I still think the idea is sound. I just keep having phone interviews getting me jobs so haven't needed to bring things in person.
-Centaura