If you didn’t already catch it, I’ve added a page to the power supply section on grounding. This is a hard topic to do justice because there is no one approach, there are just approaches that work for individuals/projects. I try to give a rough outline of my thought process and strategy for grounding projects on the new page.
Here are a couple of other good reads on the topic:
David Davenport “Audio Component Grounding and Interconnection” on diyaudio.com
Bruce Heran “Grounding and Shielding for your DIY Audio Projects” on diyaudioprojects.com