“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.

David Frank

Faster Image Insert aims to do one thing right:
Moves built-in Media Manager down in a meta-box, right next to main editing panel, so you have full control of the manager: opens it, makes it collapse or hidden from the interface completely.
Best of all, is now you can insert image(s) much faster, and precisely where you want them to be.
<ul>
<li>No thickbox, using metabox with zero interface blocking, quite similar to the uploader in WordPress 1.5</li>
<li>No hacking, default upload interface is not affected, only enhanced.</li>
<li>Insert multiple images in gallery & library mode, without using shortcode; can also insert images in reversed order, and even control spacing between images.</li>
<li>Mass info editing, change title/captions in one-shot.</li>
<li>Smart switches: set default uploader, disable captions.</li>
</ul>
This plugin is designed for:
<ul>
<li>Screenshot lover – movie, game or anime review etc.</li>
<li>Howto guru – cooking guide, hardware DIY guide etc.</li>
<li>Photo logger – author can comment below each photo.</li>
<li>Blogger that has been shouting “run, thickbox, RUN!” to the loading screens.</li>
</ul>
<h3>Notes</h3>
Translations:
<ul>
<li>Chinese – by <a href="http://bitinn.net/" rel="nofollow ugc">DF</a></li>
<li>French – by <a href="http://www.li-an.fr/" rel="nofollow ugc">Li-An</a></li>
<li>Danish – by <a href="http://wordpress.blogos.dk/" rel="nofollow ugc">Georg</a></li>
<li>Japanese – by <a href="http://ilovechibi.net/" rel="nofollow ugc">Chibi</a></li>
<li>Russian – by <a href="http://www.fatcow.com/" rel="nofollow ugc">FatCow</a></li>
<li>Romanian – by <a href="http://webhostinggeeks.com/" rel="nofollow ugc">Alexander</a></li>
<li>German – by <a href="http://www.professionaltranslation.com/" rel="nofollow ugc">Jenny</a></li>
<li>Dutch – by <a href="http://wpwebshop.com" rel="nofollow ugc">Rene</a></li>
<li>Spanish – by <a href="http://twitter.com/adrianramiro/" rel="nofollow ugc">Adrian</a></li>
</ul>
Plugin License:
<ul>
<li><a href="http://en.wikipedia.org/wiki/MIT_License" rel="nofollow ugc">MIT License</a></li>
</ul>

Faster Image Insert

Fully integrates media manager into editing interface, avoid reloading thickbox pop-up, with enhanced features like multi-insert & mass-editing.

Youtube ToolTip vs Faster Image Insert