rogeriopett

Este plugin adiciona um widget que mostra com thumbnails os ultimos videos postados no YouTube sob o username informado. 
This plugin show the latest videos thumbnails posted on YouTube under given username.

Pett Tube

Mostre os ultimos videos postados no YouTube. Show the latest YouTube posted videos.

Sibin Grasic

Responsive Videos plugin will allow you to automatically resize and scale your embedded videos on mobile devices. 
CSS selector option is provided so you can target only your post / page content container.
Features
<ul>
<li>Automatic configuration option</li>
<li>Automatically resizes / scales all your embedded videos</li>
<li>Works on all browsers</li>
<li>Highly compatible – you can change the css selector for the text highlight</li>
<li>Customizable – you can select the page type on which to activate the fitVids script</li>
</ul>

Responsive videos – Fitvids

Nice one

Good

Make your Embedded videos responsive on mobile devices with jQuery FitVids plugin

Pett Tube vs Responsive videos – Fitvids