I recently ran across this blog post
http://www.imaginaryyear.com/raccoon/2004_09_01_archive.html

... which mentions the Metafilter post about the Mayday Mystery, 
some ideas, etc. 

Inside is a mention about artist Paul Laffoley:

"For instance: artist Paul Laffoley, whose diagrammatic artworks 
are a kind of cousin to the Mayday texts ... "

I believe this is the first mention I've ever run across, and I've 
compiled the following links for reference. 

http://www.answers.com/topic/paul-laffoley

http://www.miqel.com/visionary_art/paul_laffoley_intro.html

I am both surprised, and not at all surprised, that the guy maintains
a MySpace page, at 

http://myspace.com/paullaffoley

... which includes a number of videos.

Just throwin' this one out there, with a tip of the hat to www.imaginaryyear.com
for bringing this up in the first place


-bhance