@hexdsl Just came across this clearly well researched documentary, however I fear you may have overlooked one other program. As may people these days try to "de-google" their online presence, this one may have been incorrectly swept aside. I am of course talking about Googly Eyes.
The original and best eyes that are googly and follow your mouse pointer around the screen. Some may argue that this is "too much tracking of my actions on MY pc" but I'd argue, this is what the X server is all about.