Vladimir Prelovac

Smart Youtube is one of the most popular WordPress plugins, with more than 1,000,000 downloads to date..
From version 4.0 Smart Youtube changed the name to Smart Youtube PRO and now also supports playback of Youtube, Vimeo, Metacafe, Liveleak and Facebook high quality videos, works on iPhone & iPad, produces xHTML valid code (unlike YouTube embed code), allows you to view videos in fullscreen, has video thumbnails support, has robust widget support and much more.
The plugin is designed to be small and fast and not use any external resources. It has a number of customizable options.
Main Features:
<ul>
<li>Easily embeds YouTube, Vimeo, Metacafe, Liveleak and Facebook videos (normal/HD mode)</li>
<li>Works on iPhone, iPad and iPod</li>
<li>Embed YouTube playlist (normal/HD)</li>
<li>Supports latest high definition video protocols</li>
<li>Extract video thumbnails in your archive/category posts</li>
<li>Provides a sidebar widget for videos as well</li>
<li>Supports video deep linking (starting at desired point with &start=time parameter)</li>
<li>Autoplay videos, autoplay only the first video on the page (if multiple vidoes)</li>
<li>Show video in Colorbox</li>
<li>Supports migrated blogs from WordPress.com</li>
<li>Supports migration from other Youtube plugins such as wp-youtube</li>
<li>Produces xHTML valid code</li>
</ul>
Example: 
http://www.youtube.com/watch?v=zlfKdbWwruY
Related plugins:
<ul>
<li><a href="https://wordpress.org/extend/plugins/seo-image/" rel="ugc">SEO Friendly Images</a></li>
</ul>
Feel free to check out my <a href="http://www.prelovac.com/vladimir/" rel="nofollow ugc">my blog</a>.
<h3>Credits</h3>
Some of the functions of SmartYoutube plugin came from other plugins. So I can at least thank these people:
<ul>
<li><a href="http://www.deliciousdays.com/" title="Oliver" rel="nofollow ugc">Oliver</a> for his <a href="http://www.deliciousdays.com/cforms-plugin" title="cforms II" rel="nofollow ugc">cforms II</a> plugin</li>
<li><a href="http://www.plaintxt.org/" title="Scott" rel="nofollow ugc">Scott</a> for his excellent readme.txt file</li>
<li><a href="http://www.youtube.com/" title="YouTube" rel="nofollow ugc">YouTube</a> folks for their service and javascript selector</li>
</ul>
Thanks.
<h3>License</h3>
This file is part of Smart YouTube.
Smart YouTube is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
Smart YouTube is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with Smart YouTube. If not, see <a href="http://www.gnu.org/licenses/" rel="nofollow ugc">http://www.gnu.org/licenses/</a>.

Smart YouTube PRO

Smart Youtube is a professional WordPress Video plugin that allows you to easily insert videos/playlists into your post from all major video services.

grooveshark

Currently, our plugin is incompatible with the latest version of WordPress. To get your Grooveshark Widget on your blog, we recommend using:
<ul>
<li><a href="https://wordpress.org/extend/plugins/embedly/" title="Embedly" rel="ugc">Embedly</a>, a WordPress plugin that allows you to embed content from many of your favorite sites, including Grooveshark. The free version of Embedly allows you to embed up to 10,000 URLs per month and has a friendly interface.</li>
<li>You may also use Gigya code to embed a Grooveshark widget into your blog. A quick tutorial on how to create and embed a WordPress widget is located here: <a href="http://help.grooveshark.com/customer/portal/articles/88918-embedding-a-grooveshark-widget-with-gigya" title="Grooveshark Help" rel="nofollow ugc">Grooveshark Help</a></li>
</ul>
The Grooveshark plugin is a WordPress plugin that allows you to insert a link to music on <a href="http://www.grooveshark.com" title="Grooveshark" rel="nofollow ugc">Grooveshark</a> or a <a href="http://widgets.grooveshark.com" title="Grooveshark Widget" rel="nofollow ugc">Grooveshark Widget</a> that allows visitors to play music as they view your blog.
<h4>Description</h4>
The Grooveshark plugin is a WordPress plugin that allows you to insert a link to music on <a href="http://www.grooveshark.com" title="Grooveshark" rel="nofollow ugc">Grooveshark</a> or a <a href="http://widgets.grooveshark.com" title="Grooveshark Widget" rel="nofollow ugc">Grooveshark Widget</a> that allows visitors to play music as they view your blog.
Grooveshark is a music website that allows visitors to listen to music and share music with friends. Registered users can also save favorite songs and playlists on Grooveshark. With millions of songs contributed by Grooveshark users, you can find just about any song to share with your friends and blog visitors.
The Grooveshark plugin utilizes the Grooveshark API to bring Grooveshark to your blog. Some of the main features are:
<ul>
<li>Easily find and add any song on Grooveshark to your posts, in link or widget format, as you write your post</li>
<li>If you are a registered Grooveshark user, find and add your favorite songs and your playlists to your posts</li>
<li>Preview songs while you edit with no need to open external pages</li>
<li>Add Grooveshark widgets to your blog’s sidebar or admin dashboard</li>
<li>Add RSS feeds to your blog’s sidebar that share your favorites and recently listened songs with your blog visitors</li>
<li>Allow your blog visitors to add music to post comments</li>
</ul>
What’s New in 1.4:
<ul>
<li>Adding music to your sidebar is now much easier with the new Grooveshark Sidebar options.</li>
<li>You can now preview widgets before adding them to your posts or sidebar under Appearance options.</li>
<li>Fixed a bug where some songs could not be added as links</li>
</ul>

Grooveshark for WordPress

The Grooveshark plugin allows you to insert music links or Grooveshark Widgets into your blog.

Smart YouTube PRO vs Grooveshark for WordPress