Thomas

Really simple plugin that allows you to easily add tooltips to your posts using the shortcode [wpetp].
It was made for some simple tooltips with text and/or images. For example if you want a way to add some information about a word in your post without forcing the user to leave the page to see them.
Feel free to ask for some features if you think I missed some.
Languages: English.

WP Easy Tooltips

Simple plugin that allows you to easily add tooltips to your posts using a shortcode.

eduardosada

WP-TagTip is an sexy way to show a related post of one specific tag with tooltips.
Please visit <a href="http://www.coders.me/wordpress/wp-tagtip" title="WP-TagTip" rel="nofollow ugc">the official website</a> for further details and the latest information on this plugin.
<h4>Licence</h4>
This plugins is released under the MIT, you can use it free of charge on your personal or commercial blog.

WP-TagTip

An sexy way to show a related post of one specific tag.

WP Easy Tooltips vs WP-TagTip