Personal Learning Environments

I'm not entirely clear on what is meant by Personal Learning Environments (PLE). Graham Attwell has put together a presentation with the basics.
http://www.pontydysgu.org/2009/01/personal-learning-environments-the-slidecast/
After you have the general idea, go here http://edtechpost.wikispaces.com/PLE+Diagrams
for an extensive collection of PLE diagrams.
I'm thinking I won't really understand Personal Learning Environment until I create a diagram of what works for me.