Question : Website Design - Easy Content Management Systems

Not sure whether this is a stupid question or not, but I have started developing websites for clients.  I mainly use Microsoft Frontpage for the website designing.  Some clients are now wanting to be able to update their own websites.  As you all probably know Frontpage cna not be used by just anyone without some knowledge of how website s=design works (well thats my opinion anyway).
Can anyone advise me of any good, easy, content management systems that are out there, free or otherwise, that may help me to use for my clients who want control of theri websites.  I have yet to find anything that is relatively easy to use for someone with basic PC knoweledge only.  If there is such a system I would really appreciate knowing about it.  If anyone even has any experience with packages that they think may work.

Thanks

Answer : Website Design - Easy Content Management Systems

Joomla and all those CMS are great. But for my web firm we use open source B2evolution. its a blogging back end makes it very easy for clients to login and update news/images and much more.
Check it out.
Its open source!
Extremely Customizable
 
http://b2evolution.net/