Google's Matt Cutts has proven once again that no user-submitted question is too mundane to warrant an answer. In the latest "Webmaster Help" video, Cutts semi-mockingly responds to the question:
It would be a really great feature to mark an email as important in Gmail. Will this ability ever be added?
After "going back in time to add that feature," and "using the time machine," (which involves some Wayne's World-esque hand gestures and sound effects) he discusses Google's Priority Inbox feature, which was launched in 2010.