PLE Descriptions & Sample
In this article, Graham Attwell describes Personal Learning Environments (PLEs):
http://digtechitalia.pbworks.com/w/file/fetch/88358195/Atwell%202007.pdf
(Reference: Attwell, Graham (2007). The Personal Learning Environments - the future of eLearning. eLearning Papers, vol. 2 no. 1. ISSN 1887-1542.)