SEO friendly CMS

Mambo
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Drupal
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Textpattern
A flexible, elegant, easy-to-use content management system for all kinds of websites, even weblogs. Small and SEO friendly.	website download support

EZPublish
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Geeklog
blogging software.	website download

Movable Type
Blogging software.	website download

Plone

Plone is powerful and flexible. It is ideal as an intranet and extranet server, as a document publishing system, a portal server and as a groupware tool for collaboration between separately located entities. Plone is easy to use. The Plone Team includes usability experts who have made Plone easy and attractive for content managers to add, update, and maintain content. Plone is easy to install. You can install Plone with a click-and-run installer, and have a content management system running on your computer in just a few minutes. Plone is international. The Plone interface has been translated into over 40 languages, and tools exist for managing multilingual content. Plone is standard. Plone carefully follows standards for usability and accessibility. Plone pages are compliant with US Section 508, and the W3C's AA

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Rainbow
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Xoops
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WordPress
WordPress is a state-of-the-art semantic personal publishing platform with a focus on aesthetics, web standards, and usability. What a mouthful. WordPress is both free and priceless at the same time. More simply, WordPress is what you use when you want to work with your blogging software, not fight it.	website download

Articles about SEO friendly CMS:

Search Engine Watch: SE-friendly Open source CMS
Search Engine Watch: Drupal installation guide

Ranking:

1. Drupal
2. Mambo
3. Textpattern