“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.

Xanthonius

I created this plugin to help when creating sites that have fixed headers, if you fix the header to the top of the screen you then have to go in and add additional styles for logged in users that have the admin bar, after doing this on quite a lot of sites I thought a better way to manage this might be to allow the admin bar to be toggled in and out of view on the front end, whilst still keeping everything fixed to the top of the browser!
The plugin simply adds a button to the far right of the admin bar, shifting the whole bar up past the top of the screen (out of view) except for the button, on click of the button the admin bar slides into view.

Toggleable Admin Bar

Allows you to toggle the admin bar on the front end. Useful for websites with fixed positioned elements where the admin bar is in the way.

Youtube ToolTip vs Toggleable Admin Bar