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I would prefer Joomla because of cheap development, cheap hosting and strong commercial market/extensions.<br />
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Here are some links will which help you to make a decisions.<br />
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<a href="http://www.dotnetnuke.com/Community/ForumsDotNetNuke/tabid/795/forumid/118/threadid/75766/scope/posts/Default.aspx" rel="ugc">http://www.dotnetnuke.com/Community/ForumsDotNetNuke/tabid/795/forumid/118/threadid/75766/scope/posts/Default.aspx</a><br />
<a href="https://www.experts-exchange.com/questions/22062775/DotNetNuke-vs-Joomla-for-CMS-small-sites-fast-development-what-do-you-prefer.html" rel="ugc">https://www.experts-exchange.com/questions/22062775/DotNetNuke-vs-Joomla-for-CMS-small-sites-fast-development-what-do-you-prefer.html</a><br />
<a href="http://www.webhostingtalk.com/showthread.php?t=633088" rel="ugc">http://www.webhostingtalk.com/showthread.php?t=633088</a><br />
<a href="http://blogs.ninameiers.com/2007/06/02/Joomla+Or+DotNetNuke.aspx" rel="ugc">http://blogs.ninameiers.com/2007/06/02/Joomla+Or+DotNetNuke.aspx</a><br />

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I think you might want to look for local user groups and see who is nearby with experience in the two systems. &nbsp;Personally, I would choose Joomla or Drupal, but that is because I have easy access to experts in those systems. &nbsp;If I have a hiccup, I know where to go for help.<br />
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Best regards, ~Ray
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well the thing is, which one will alow me to program add pages (modules) and customization for a video streaming site, such as youtube.com 
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Any CMS will let you do that - even Wordpress. &nbsp;I would think that the programming and data base work will be more of an issue than the integration with the CMS, which should be very easy.
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I think you want to do I will go for Joomla ... Very easy to customize ... its has plygins, modules, components etc ...
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nice, so last question , I am not that familiarized with neither joomla or dotnetnuke, but how is the idea of adding code php or asp.net C# , into this,, do I need to code my own stuff, or is enought with the plugins I install, say I want to add a database that handles podcasts or videos...
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RickyGtz:<br />
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Joomla already have a video / youtube products out in the market ...<br />
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You can check all extensions here<br />
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<a href="http://extensions.joomla.org/" rel="ugc">http://extensions.joomla.org/</a>
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whats the name of that particular extension
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<div class="content wysiwyg-content">
I was recently asked to do a Multimedia page and the options are Joomla or other similar CMS. I am wondering what the limitations pros- cons are in this application framework, over DOTNETNUKE and whats more convenient to use being a ASP NET Programmer not really a mysql php user. I can learn the basics I guess, but would it really worth for a project has anyone has expereicne with both??
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I was recently asked to do a Multimedia page and the options are Joomla or other similar CMS. I am wondering what the limitations pros- cons are in this application framework, over DOTNETNUKE and whats more convenient to use being a ASP NET Programmer not really a mysql php user. I can learn the basics I guess, but would it really worth for a project has anyone has expereicne with both??

Joomla or DOTNETNUKE

A web-based content management system (CMS) provides website authoring, collaboration, and administration tools that enables users with little knowledge or experience to create and manage website content. Most CMS systems use a content repository or a database to store page content, metadata, and other information assets, and a presentation component that displays the content to website visitors.

Web-Based CMS

Content management (CM) is a set of processes and technologies that supports the collection, managing, and publishing of information in any form or medium. When stored and accessed via computers, this information may be more specifically referred to as digital content, or simply as content. Digital content may take the form of text (such as electronic documents), multimedia files (such as audio or video files), or any other file type that follows a content lifecycle requiring management.

Content Management

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.