Are you really wanting a Content Management System, or just a tool that allows people who don't know how to build websites to build websites? There is a difference, you know. I built the latter a while back for a client, thinking it was the former. But it wasn't. Still -- it worked, for that client. She didn't know HTML or file management, but i built a system that allowed her to add pages, content to those pages, those pages to the menu, etc. But i couldn't allow her control such as placement of everything on the site: where the menu goes, where the ads go. You see, there is a fine line between the control you can allow the unskilled to have and the control that skilled users need to have. That's one major factor that keeps CMS systems from being truly generic.

At any rate, if you don't know about HTMLArea, then read up on it. It turns a regular HTML textarea into a WYSIWYG HTML editor, much like a Word application. The HTML it produces is not the cleanest, but who cares if your client can use it and it still renders in the browser? Here is an archived example that i keep handy, in case you want to check it out. I think i am still allowed to do that ... :O

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)