wp_summary will automagically show a summary of your post at its beginning, using h1, h2 and h3 tags to create sections.

Outerbridge

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Divide your post content into parts that you can show in different areas of your theme templates.

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The Other Content

By default, WordPress gives you one editable content area per page. The Other Content allows you to create additional content areas for some or all of …

Didier Sampaolo

When you write a long post, it is common to add h2 and h3 tags to create sections on a specific topic. This plug-in will search these sections and add a link to each of them at the beginning of your post. Each section will become a named anchor, allowing the user to browse quickly through your post. 
This summary is also understood by major search engines and should improve your CTR (click-through rate) by providing richer snippets.
<a href="http://www.didcode.com/code/wp-summary.html" rel="nofollow ugc">Plugin home page</a>

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