Sorry, I’m just seeing this Steve. How to Take Smart Notes: One Simple Technique to Boost Writing, Learning and Thinking – for Students, Academics and Nonfiction Book Writers by Sönke Ahrens is one of the better ones I’ve seen lately. It’s relatively in-depth and has lots of good advice.

Much shorter and quite elegant is The Intellectual Life: It’s Spirit, Conditions, Methods by Antonin Sertillanges (1918), particularly a section from Chapter 7. I haven’t read the rest, but later chapters on writing are probably pretty solid too.