I'm quite new to Stack Overflow but enjoying the experience.
Had one annoying moment the other day spending a few minutes mocking up a test case and composing an answer, to find in the mean time the question had been down voted then closed as spam.
Would of be great to have had AJAX banner that provides pre warning of down votes and closure. Perhaps even a traffic light system, orange warning of impending bad vibes and then full on red for closure or deletion.
Was 5 minutes wasted that left a bit of dirty aftertaste!
Note: The question that was closed didn't appear to be spam, but people noticed a duplicate by another user with the same image, hence the closure. Not obvious at first glance.