I like this website and have read most of the topics. I post the homepage URL to show all the topics available, but take note of the few topics on project management. I've had a long interest in the convergence of PM & KM, and both share some similar qualities from the systems-oriented perspective. There are a lot of other authors and resources out there that talk about PM from a systems-thinking approach, but I thought this site a good starting point. A good book for expanding on this topic is Gerald Weinberg's "An Introduction to General Systems Thinking."

This site provides a good overview of the Scrum methodology and information about training and certification programs. I went through an onsite Scrum Master course a year ago and was recently reminded that it was time to renew my certification. The Scrum Master test was pretty easy right after the training.