Not sure if the readers of this forum have seen TiddlyWiki (
http://www.tiddlywiki.com/). This is a brilliant SINGLE file Wiki that works both online and offline (developed in pure Javascript). It has all the features of a Wiki such as editing, saving, tagging and searching) and is simply super for collaboration. There are numerous plugins, extensions to the base version that improve on the core functionality. We should consider having TiddlyWiki inside OpenGoo as it would increase the collaboration functionality many fold.