Bernhard Kau

This plugin will show the first post with its full text but all the others with the text after the “more” tag

First Post Full Length

This plugin will show the first post with its full text but all the others with the text after the "more" tag

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>

First Post Full Length vs The Whole Post