Harold, great post and I've been intrigued by the synergies/cross-overs between PKM, personal learning, informal learning and eLearning. I have a strong belief right now that we are all struggling with our own Personal Productivity Improvement - especially with the rapidly changing landscape for Personal Learning. So, I wonder how well we can realistically help others with PKM, personal learning, etc. More thoughts at:

eLearning Technology: Personal Learning for Learning Professionals - Using Web 2.0 Tools to Make Reading & Research More Effective