I have always been irritated by the different markups of the different wikis, so this project appears to be good and important. I am not a professional web developer or alike, so my support will be very limited. Since apparently nobody did so before, I created a Wikipedia entry for Creole:
http://en.wikipedia.org/wiki/Creole_(markup)
. Including Creole in
http://en.wikipedia.org/wiki/Lightweight_markup_language
could be the next step?
If you feel like contacting me (in German or English), try tobias {at} schaechtelin {dot} de