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.

jazzigor

“play-button” lets you place one or more simple mp3 play buttons to your posts, pages or widget contents. 
It’s as easy as placing the simple <code>[play-button:mysong.mp3]</code> mark-up anywhere in your text.
This plugin uses the free flash-based mp3 player by Fabricio Zuardi and the 
<a href="http://musicplayer.sourceforge.net" rel="nofollow ugc">“XSPF Web Music Player”</a> team.
More info at <a href="http://www.thickthumb.com/open-source/play-button" rel="nofollow ugc">this plugin’s homepage</a>. 
See a real-world use example at this <a href="http://www.jazzmadrid.com/cd/" rel="nofollow ugc">music site</a>.

play-button

"play-button" lets you place one or more simple mp3 play buttons to your posts, pages or widget contents.

Smart YouTube PRO vs play-button