indowp

This Plugins that makes your site SEO boosting by making your defaut description change everytime you add new post on homepage only. This plugins usefull for those running news site or you are an up to date blogger. 
Many others SEO Plugins doesnt have this feature, they just make keep static description and makes google bored if you have an up to date blog.
<h4>Features</h4>
<ol>
<li>Automatically generate description on your homepage based on last 3 title post, this is real good for your site SEO.</li>
</ol>

Wp SEO Auto Generating Metatag Description

This Plugins that makes your site SEO boosting by making your defaut description change everytime you add new post on homepage only.

satourne

Head Meta Date (formerly “Head Metadate”) improves the definition and semantic quality of your web pages by adding a set of date <code><meta></code> tags to the <code><head></code> section of your web pages.
Example
<pre><code><head>
 ...

 <meta http-equiv="Date" content="Wed, 16 Feb 2011 22:34:13 GMT">
 <meta http-equiv="Last-Modified" content="Wed, 17 Feb 2011 12:34:13 GMT">
 <meta name="CreateDate" content="Wed, 16 Feb 2011 22:34:13 GMT">
 <meta name="Last-Update" content="Wed, 17 Feb 2011 12:34:13 GMT">
 ...
</head>
</code></pre>
Features
<ul>
<li>Plug-n-play functionality</li>
<li>Easy to configure from the WP Admin</li>
<li>Adds set of meta tags to <code><head></code> section of posts and pages</li>
<li>Customize each <code><meta></code> tag with your selected date info</li>
<li>Leaving any field blank generate a now date</li>
<li>Auto-generates known information from your site</li>
<li>Choose HTML or XHTML format for meta tags</li>
<li>Enable/disable plugin output from the settings page</li>
<li>Includes live preview of your meta tags and custom content</li>
<li>Option to reset default settings</li>
</ul>
This plugin is designed to complete a site’s head construct by including some of meta tags. 
Note: the metadata output via this plugin applies to the entire site.
<h3>Donations</h3>
I created this plugin for my usage and decied to share with the WP community. I completely use the Head Meta Data WordPress plugin. 
Send some stars to Jeff Starr.
Links, tweets and likes as you want …

Head Meta Date

Head Meta Date adds a set of date <meta> tags to the <head> section of all posts & pages. This is a fork from http://wordpress.

Wp SEO Auto Generating Metatag Description vs Head Meta Date