Have you used WordPress or Joomla! before? If not, you should. I achieved a personal revelation the first time I saw WordPress (and generally all the CMS-like web applications out there). I was ready to buy Dreamweaver and start designing my sites by myself when I found that everything I wanted to do for my simple sites was covered by WordPress.
Beyond simply "configuring" WordPress, an amazing amount of customization can be done in creating a custom theme. And once you get into plugins its hard to say where the limit is for a primarily content-driven website. And if you do find that limit, there's always Joomla!
The idea is that you would administer the WordPress installation and have your client be an "author". You can have them edit static content pages or create new "blog-style" news posts.
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