I'm torn about this takedown. Until today I had no idea it was based on prior work.
If they left the comic up but clarified what it was inspired by it would definitely help the Postman estate.
The conversion rate of "Do yourself a favour and read Neil Postman's words in full. Purchase a copy of Amusing Ourselves to Death new/used (aff)" must be a rounding error on 0.
Definitely agree that the comic, staying at one canonical ___location, could have served as a boon to the sales of the book and awareness of its themes.
(I'm guessing that the subtlety of the comic's original Postman mention – at the very bottom – compared to the top line "AMUSING OURSELVES TO DEATH by Stuart McMillen" may have started the attribution discussion off on the wrong foot.)
http://www.recombinantrecords.net/docs/2009-05-Amusing-Ourse...
...but was apparently taken down due at the copyright holders' request. More on the book:
http://en.wikipedia.org/wiki/Amusing_Ourselves_to_Death