Since coming across George Siemens I was immediately taken by his theory of connectivism. Being heavily focused on cognitive and constructive theories of learning as part of my study, I had a gut instinct that there is something in George's theory. I have since enjoyed many of George's articles and the clarity of argument that is contained within them. I find the principles of connectivism outlined on the connectivism wiki very useful in comprehending connectivism and situating learning strategies within this theory of learning. Some principles of connectivism are outlined here: About — Connectivism.
Critiques of the theory include:
Bill Kerr: http://billkerr2.blogspot.com/2006/12/challenge-to-connectivism.html
Bijdrage van Pløn Verhagen:
George Siemens response to Pløn Verhagen critique