Whiteboards are pages that members of various E and Capabilities discussions can hash stuff out upon.
Whiteboard means, like a wiki page only more purposely, visibly and messily so.
Might invent some etiquette. For instance: don't just erase someone else's content. Maybe stages like: add comment about why it's not needed/obsolete/resolved/off-topic etc., discuss on whatever list, reduce font size, finally move to a "resolved" section.
To create a whiteboard: edit this page, add a link to the new whiteboard, save, then click the link. Probably put a first sentence saying the new page is a whiteboard, with link back to here.