The Whole Post
When you show partial posts on your main page or archives and you have "read more" links, clicking those links will redirect the visitor to a position in the post. The visitor will not see the post from the begining. This is bad if you have an ad at the top of your post cause the visitor will not see that anymore.
This plugin will modify the default behaviour of the "read more" so the visitor will see the post from the top when they click the "read more" links.