PLE Diagram

Another attempt - this time using Gliffy - to illustrate my own thinking about what a PLE should entail.

I created a demo of a part of this concept ages ago, here - it is never listed as among the "examples of PLEs" but is in fact a first draft of what I think a PLE should look like (I promise to lose the yellow, though). It doesn't really work in Internet Explorer, but it works just fine in Firefox.