I have a custom CMS that runs from within the browser (editing is ajax driven) it means that there is effectively no back end, as editing is done live and in the page. we are launching it as a new product for clients this month
the other good thing is that any static site can be converted to using it , making it an ideal low cost solution for technophobes who can use a word processor and little else.
I should have a working demo in place this week, and will post a link. Unfortunately though it will not be available to buy as a stand alone product, it is part of our package.