UPDATE: I sent them an e-mail about the "Previous Post" and "Next Post" flip, and now I notice that they're back to their old format.
Maybe the blog format is up and coming and was just released too soon. Maybe it was released today, but they found some bugs so they got rid of it (temporarily?).
NPR's Song of the Day has just changed its format to a blog format where the permanent links give you individual day pages similar to the previous format (though the "Next Post" and "Previous Post" links on the individual posts seem to be flipped at the moment).
So that's interesting.