Where would one put general requirements for plasmoids? For example I think that a plasmoid should be able to glue itself to a normal window, e.g. a kopete chat-window and act as "plug-on", i.e. communicate with the chat-window and e.g. display the buddy-icon of that chat-partner or contact-details, such as new email received by kmail etc.
So plasmoids would have to be able to start automatically when a new chat-window opens and glue themselves to it.
I don't know where to report this so I'll do so here: the notice on http://plasma.kde.org/ that links to this wiki links to "Projects/Plasma/" (note the trailing slash), which is a non-existing page, the right one being "Projects/Plasma".