RT Wolf, I've had this problem before, what I did was use one of those portable file boxes, kind of like what layers use, some of them have 5 folders and some as many as 50, I just took the one that had the 5 separations and filled it with my folders and it worked great for what I was looking for.
Something like this from Staples:
Staples.comŽ. that was easyŽ.
Good point RTWolf.... Another point is that if you are going through life currently where there's not much to keep track of, for instance you're taking a ********l or you're a student on summer vacation, than GTD would be an overkill.
Pat, you bring up a very good point, this is especially useful for liberal arts majors where you have to keep track of many references and sources (and some others fields or instances), in that case I would actually recommend getting specialized software and use that to manage the sources/references.