These are HTML versions of Kai's Power Tips and Tricks for Adobe Photoshop. They have been written by Kai Krause in the early 1990s.
The Interface of Kai Krause’s Software
What are the meta guys doing today? Check out MetaTools, MetaCreations, Meta...?
Steve Nelson's epiphany at gurusnetwork.com/kpt/
Paul Smith interviews Mike Migursky, March 2012