I think that NP's current selection of topic areas is valid and well-considered. All the same, as contributors grow, there is sure to be an expansion in themes. There are historical, tangential, even "trivial" areas that have relevance to the news. They aren't opinion in the op-ed sense, and may be every bit as objective as the content in the established categories.
Please refer to the discussion thread in this story http://www.nowpublic.com/those-who-misquote-george-santayana-are-condemned-paraphrase-him for some detailed and lively (yet civil) discussion of this issue (or trend, if you will).
Anyone up for a discussion?
Contributed by denseatoms http://members.nowpublic.com/denseatoms