This is what I found so far:
http://www.kloonigames.com/blog/general/wanted-constructive-criticismThis means th3e first prototype of crayon physics is from Friday, June 1st, 2007, means about 2,5 years ago.
On the page of
http://complex.ovh.org/ I found only this date, but this doesn't mean that he couldn't have published it earlier:
"PhysicDraw (Download: Mirror1 - Mirror2) - Last release: 03/16/08"
I suppose 03/16/08 means 1,75 years ago, but it is possible that he produced this engine/game earlier.
++++
Found this site with the names of both developers:
http://www.greatgamesexperiment.com/sitemap/developers/Here there profiles:
http://www.greatgamesexperiment.com/user/Sphax/http://www.greatgamesexperiment.com/user/Petri%20Purho/Sadly, these pages don't shad any light on whether who developed first.
(Petri Purho has a video in his profile which looks like quite some fun. I like its sort of mechanic and graphics.)
