We do have this thread:
Books that you wish were at the Connect store. Let's keep that one for books.
But you seem to be getting at non-book content. I'd be interested what people think. We now have this
Rss2Book solution (already in version 7 with lots of new features!) for converting from RSS feeds to Sony Reader books. I'm not sure about what possibilities there are for magazine-like content on the Reader. It will be interesting to hear what people think and would like.
BTW, Harvard Business Review does have
this site with an associated daily RSS feed.