I have never seen a plugin that does the following but maybe that is because no one has mentioned it or I have missed it. I know the theme has some play in what I am about to say but I still think a plugin could do this.
I have a page where my blog posts go to called the original name of blog.
each post that appears on that page has a read more button that takes you to the post
on my site. So far that is how it suppose to work. I would like to be able to define in the post
where the read more will take you on the main stream of posts that appear on the blog.
It would be nice to be able to place a link in a field, maybe say popup, or light box and point the read more on the blog site to the original site that I get the full posting from ?
This is just some thing I have come across that would be nice if it existed.