One site I visit a lot is SEOmoz.org, a great resource for SEO and marketing. I noticed today that that have a great top 500 list of "most important domains".

I was interested to see that Joomla, Wordpress and Drupal all make it into the top 500, with Wordpress taking the lead, and Drupal bringing up the rear.

The corresponding top 500 pages list saw Wordpress.org and Joomla.org in the top 15!

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