peterwsterling

A plugin which looks for <IMG> tags in the excerpt and, if found, wraps them with a link to the post permalink.
Helps with thumbnail images in the excerpt shown on the index page. There isn’t any rocket science here – it’s simply up to the post author to provide the image (and text) in the optional excerpt in WordPress’ write a post form. However, the “trick” bit is to make that thumbnail image a hyper-link to the post. I’ve done this with this simple WordPress plug-in.

Excerpt Image Link

A plugin which looks for <IMG> tags in the excerpt and, if found, wraps them with a link to the post permalink.

ryokurosu

This plugin is to fast index , and optimize ping function. For your website, speed index is very useful way to notify subscribers and users.
This plugin has also ping optimizer. Ping send only publish. 
So tell the world your website is not spam.
This plugin:
<ul>
<li>Sends fast speed notifications when you update your blog</li>
<li>Supports multi-user installations (WordPress MU)</li>
<li>Supports multiple hubs</li>
<li>Supports all of the feed formats used by WordPress, not just ATOM and RSS2</li>
<li>Supports latest specs
<ul>
<li>PubSubHubbub <a href="https://pubsubhubbub.github.io/PubSubHubbub/pubsubhubbub-core-0.4.html" rel="nofollow ugc">Version 0.4</a></li>
<li>WebSub <a href="https://www.w3.org/TR/websub/" rel="nofollow ugc">W3C Version</a></li>
</ul>
</li>
<li>Announces which hubs you are using by adding <code><link rel="hub" ...></code> declarations to your template header and Atom feed</li>
</ul>
This plugin will ping the following hubs:
<ul>
<li><a href="https://pubsubhubbub.appspot.com" title="Demo hub on Google App Engine" rel="nofollow ugc">Demo hub on Google App Engine</a></li>
<li><a href="https://pubsubhubbub.superfeedr.com" title="SuperFeedr" rel="nofollow ugc">SuperFeedr</a></li>
</ul>
Please contact me if you operate a hub that you would like to be included as a default option.

Fast Speed Index

this is a better way to fast index for your website.

Excerpt Image Link vs Fast Speed Index