Times Skimmer and Old Content

I'm STILL baffled at how the Times Skimmer (from the New York Times) can have such an incredible interface - the best news reading experience on the web - and still be so poor when it comes to presenting timely content. I've said it before (but apparently they're not listening?), why do they intermingle old stories with new? I can't imagine open the paper version of the Times and having to discern which stories are from today, and which are from yesterday, the day before, etc. I understand that these stories may still be relevant, but at a bare minimum the site should offer a "show me only stories published today" filter.