I have been on the CMS booth at Linuxtag and the general agreement there is: If you need a CMS system, go with Typo3. I think we can and should learn from them, maybe meet up on an OSCOM conference as well, but in the end we have to be aware that the focus of OpenACS is larger. So, if you work with a client on a CMS like site you might want take a look at Typo3 first and get some ideas there.
Furthermore, to my knowledge the OSCOM people are writing a new WYSIWYG editor that we should be able to incorporate as well in exchange for htmlarea.