Joost de Valk

Easy contact form, embed it in a post or page by writing the shortcode [wpcf].
Features:
<ul>
<li>Spam protection.</li>
<li>Shows referrer information for the person contacting you.</li>
<li>Option for user to send himself a copy of the message.</li>
</ul>
More info:
<ul>
<li><a href="http://yoast.com/wordpress/enhanced-wordpress-contactform-plugin/" rel="nofollow ugc">Enhanced WordPress Contact Form</a>.</li>
<li>Read more about <a href="http://yoast.com/articles/wordpress-seo/" rel="nofollow ugc">WordPress SEO</a> so you can get the most out of this plugin.</li>
<li>Check out the other <a href="http://yoast.com/wordpress/" rel="nofollow ugc">WordPress plugins</a> by the same author.</li>
</ul>

Enhanced WP Contact Form

Easily add a contact form with spam protection to your pages, and get additional data about your visitors with each e-mail!

Remy Perona

This contact widget comes with microdatas & microformats markup, so that search engines can use it in their search results. They can help display contact information about your business or yourself below your website in search results, and even a map with your location, to improve your local SEO.
The telephone & email are linked so that visitors can click on it and make a call (through mobile or skype) or send a mail from their computer or their mobile devices.
You can also display a static image map of your location, linking to the address’ Google Maps page, and display a download link for a vCard.
More informations on microdatas microformats can be found here :
<ul>
<li>http://schema.org</li>
<li>http://microformats.org</li>
</ul>
Feedbacks and suggestions for improvement are greatly appreciated ! You can go to github to help : https://github.com/Tabrisrp/rich-contact-widget
Rich Contact Widget requires PHP5 to work !
Credits for translation :
<ul>
<li>Slovak by <a href="http://webhostinggeeks.com/blog/" rel="nofollow ugc">WebHostingGeeks.com</a></li>
</ul>

Rich Contact Widget

A simple contact widget enhanced with microdatas & microformats tags for your local SEO

Enhanced WP Contact Form vs Rich Contact Widget