Yes, I can see how "Purple-Linking" could be a powerful way of building up your knowledge base on a certain subject. I've been doing that by instinct but my challange with it is the drifting...Sometime, I open too many windows diving deeper in the topic, that I loose trail of my original point and just keep going. Although I do learn a lot, but there's the challenge of opening up many new concepts to learn about and time keep dragging to making a closing on my original point. From your words, I have a feeling you're in education / training / learning field.