“Youtube ToolTip” is a simple plugin, which changes all your links of “youtube” on a fast preview for the convenience of your readers.
Modifying all the links and using “jQuery” shows an attractive & modern blog.
Also use “qTip”, qTip is a tooltip plugin for the jQuery framework. It’s cross-browser, customizable and packed full of features! 
qTip is licensed under the open source MIT license, which allows you to use the script for whatever you want, whenever you want, however you want, as long as you include a copy of the license!
For more information about this plugin visit http://javiergalicia.wordpress.com/2009/07/03/youtube-tooltip-to-wordpress/

Youtube ToolTip

"Youtube ToolTip" Click on any of your links to get a quick preview of the youtube video.

ZenixSol

The quick and easy way to let users add image as post from the frontend of your site.
<h4>Overview</h4>
Looking for a quick and easy way to post image directly from the frontend of your site? The Quick Post Image Widget has it all! 
This plugin provides a widget to post image directly from the frontend of your site without going into the backend for registered users with post status levels.
<h4>Features</h4>
<ul>
<li>Post image directly from the frontend of your site (sidebar or page).</li>
<li>Set post status for different user levels (2 options available).</li>
<li>ability to add tage to post</li>
<li>ability to select categories for post 
Front-end:</li>
<li>Choose file (will be added as image in post)</li>
<li>Image link (This link will be added to image)</li>
<li>Post tile (this will be title of post)</li>
<li>Ability to select category for this post</li>
<li>Description (will be added as caption)</li>
<li>Tags (ability to add comma separated tags)</li>
</ul>
For admin 
– Post title 
– First User role and post status 
– Second user role and post status

Quick Post Image Widget

This plugin provides a widget to post image (as post) directly from the frontpanel of your site without going into the backend for resgistered users.

Youtube ToolTip vs Quick Post Image Widget