In a world where resources for newsgathering seem to grow ever scarcer, I suppose it's not surprising that the media tend to grab a tale and run it to death. Political news has a certain shelf-life that prevents its being overdone, and of course, politicians are always out there talking, generating "new" political stories.
In other areas, though we aren't so lucky. Today we are reminded that it was a year ago that Michael Jackson died, so we endure generous replays of year-old interviews and news reports, while perhaps also recalling that it's only been three months since the media stopped carrying daily "stories" about his death. They might be carrying them still today, if we hadn't had that nice oil spill in the Gulf of Mexico, which promises to be a story that can be overreported for months to come.