WikiCreole is a basic set of markup rules for wikis. It is hoped that developers will add Wiki Creole to their engines as fast as possible, making it easier for people contributing different sites using different WikiEngine?s.
Seems that perhaps this WikiMarkupStandard? effort has the most momentum yet. I am excited about it and hope that it wins (not because I prefer it to other markups intrinsically, but because I’d just like some standard).