Lori, I don't think I'll weigh into an argument on PKM as I'm more interested in making things work for people and organisations. My perspective has been especially influenced by Lilia Efimova and Dave Pollard:

http://blog.mathemagenic.com/2004/02/16.html#a1089

http://jarche.com/2009/02/understanding-blogging-for-knowledge-workers/

http://blogs.salon.com/0002007/2005/11/23.html#a1349

People may debate all they want, but I want to focus on what works. PKM works for me and for many others, though we may quibble on its definition and nuances. I'm not developing an academic thesis; I am a practitioner and my work is to help my clients.