Mambo
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Joomla is a very popular open source content management system.
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How effective is a site re-design? The final proof is in site traffic.
Our website ( taragana.com ) needs to continuously adapt to our growing business.
MODx is an excellent AJAX enabled content management system, which is leagues ahead of Joomla / Mambo.
I have been an avid user of Mambo and now Joomla since 2001.