Everything handwaving freakoutery (it's a blog) publishes on egregores I found highly relevant and entertaining.

Actually, everything contemporary mentioning egregores is probably relevant - they're also called 'AI autocults', but the concept existed long before group communication became enmeshed with computer infrastructure - though the dynamics are different now than in enlightenment-era Europe, and the pre-Newtonian assumptions of the older publications throws most modern readers off.