I just found on the internet Umbraco. This is a free CMS system and it looks great. The current release is version 3.0.6. I saw a screenshot of it, and that looks really great!
Check it out at: http://www.codeplex.com/umbraco
Unfortunately, the back-end database is a SQL Server variant. To use it with MySQL or a database you like, you should wait untill release 4, which will be the next release. They expect a final release of version 4 at the end of this year. That's why I have to wait until then.
For the time being, I just play around with version 3.0.6 on a virtual pc (currently trying to install the whole stuff).
I am really looking forward to use this product. To get an indication of the quality, peugeot company, Heinz and even Microsoft (MS Developer Network in Denmark) are using this platform.