Flyspeck CMS - Browser based page editing.

Flyspeck lets your clients edit their web pages themselves
while still allowing you the control you need over the templates.
Flyspeck was built by people who have a need to let non-technical users just update a portion of a web page, sometimes more than one portion, without any installed software.
No database needed!
The only web-page editing system that allows your users to browse as they ordinarily do and choose to edit.

Additional Features:

Image Upload and select from your /images dir.
Multiple editable chunks in one page (so they don't wreck your layout)