Having just switched from reading via RSS reader to reading via reading page I want to say OMG YES a lot to this suggestion.

The thing that bugs me most about having switched is that I have to make myself read all the older-but-unread entries before I flip back to read the newest unread things because otherwise I'll get hellaciously confused about where I'm up to. I liked being able to flip around so much in my RSS reader and this wouldn't totally fix that issue but it'd certainly help!