I ran across some medical info in the Wikipedia that HAD to be fixed as I was looking something up and I noticed Wikipedia uses the same space at the top of the page content for both temporary notifications (e.g. "this is only a preview, and has not yet been saved") and longer term notifications (e.g. "server going down for maintenance in X hours"). A hook for longer term messages with a got-it-now-leave-me-alone button would be nice (just noting for prosperity: I realize implementation is out of scope).
