Updatable content?

I have a potential client that would like me to design an HTML-based site. However, she would like to be able to update certain sections of the site in the future as the need arises. As she is a motivational speaker, this would include Scheduled Appearances and so forth, for example.

I have experience in PHP-Nuke for community based sites, but she is not looking for this deep of a site. I am just wondering how I would be able to implement such a request so she can easily change content on a specific page or two should she desire.

Any tutorials or links or anything that can help point me in the right direction to figure this one out would be greatly appreciated. Thanks!