Wooliet

“Read More Right Here” uses the jQuery framework already included with WordPress installations. RMRH hooks into the WordPress creation of the 
“more” link and adds a custom class. When your blog is loaded, all links of this custom class are modified to no longer send the user to that post’s 
single page display when clicked. Instead, the WordPress database is queried for that specific post, and all content after the  tag (i.e. only what you need) is returned. 
The new content is then immediately displayed to the user, inline with the opening content.
For more information, please visit the <a href="http://www.wooliet.com/wp-plugins/" rel="nofollow ugc">Woolie T. WP plugins page</a>.

Read More Right Here

Automatically transform your 'more' links into "view right here" links that immediately display the rest of your entry.

The Striptease plugin changes WordPress’s default Read More teaser links so that they link to full posts.
WordPress makes it easy to break up long posts so you can save space on your home page. Simply insert the <code></code> quicktag while editing a post, and WordPress will display the text that comes before it as a teaser followed by a Read More link to the rest of the post. When a reader follows the link, the single-post page is loaded and the browser jumps to the unread text.
This jump can be disorienting, and some bloggers prefer to link their teasers to the full posts instead of the unread text.
That’s where the StripTease plugin comes in. It automatically strips the #more fragments from the end of your teaser links and turns them into links to your full posts.
<h3>Example</h3>
The StripTease plugin automatically changes your teaser links from this:
<pre><code>http://guyfisher.com/2005/09/striptease/#more-6
</code></pre>
To this:
<pre><code>http://guyfisher.com/2005/09/striptease/
</code></pre>

StripTease

Strips the #more fragments from the end of Read More teaser links so they link to full posts.

Read More Right Here vs StripTease