Google Webmaster Guidelines > Content Management Systems
Content Management Systems must create pages that are understood by search engine crawlers in order for your website to be properly indexed by search engines.
There are many different things to consider when choosing a content management system (CMS), but this guideline only states one. To follow this guideline your CMS must create web pages that search engine spiders can crawl.
Every content management system in some way takes your data and turns it into web pages.
The web pages that come out of the content management system should be able to be understood by Googlebot.
Would you hire a webmaster who could not create web pages that follow the guidelines?
When deciding on a content management system make sure it can do what you need it to do. If following these guidelines is what you want, then find a CMS that results in pages that follow them.
An informative article on CMS:
Choosing a CMS to build your website
Content management systems defined by Wikipedia:
Content Management Systems
This article was written by Patrick Sexton, who has been helping webmasters with the Google Webmaster Guidelines and other issues since 2005.