mihai

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.
More info:
<ul>
<li><a href="http://patchlog.com/wordpress/the-whole-post/" rel="nofollow ugc">The Whole Post plugin</a>.</li>
<li>Check out the other <a href="http://patchlog.com/wordpress/" rel="nofollow ugc">WordPress plugins and mods</a> by the same author.</li>
</ul>

The Whole Post

pyko

A simple plugin that allows you to modify the link that is displayed when you use the <!–more–> feature. Also lets you remove the anchor link to turn off the jumping behaviour. You can also choose to have the more link open in a new window/tab.
You can choose to have just plain text, or also include the post’s title. If you chose to include the title, you can limit the number of characters/words that are displayed in the title. Also allows you to add ellipsis (…) to the title if it has been truncated. All the options can be found in “More Link” tab under “Options” in admin page.

The Whole Post vs More Link Modifier