The key probably is to have a basic, easy to deploy platform with lots of hooks to allow for more complex plug-ins and modules.
I've got a sense of where Chatmaster is expecting to get his edge in this. Just remember your target market then is probably going to need as close to a plug 'n play solution as possible because they are not particularly web-tech savvy.
Also, from a user point of view, WYSIWYG editors in most online CMS applications are fine for capturing text and image presentation - but are not that hot for presenting table layout info (other than posting a link to a spreadsheet, which is a really sucky solution). Solve that without the user having to resort to manual HTML coding and you'll have made a leap forward in the data presentation side too, I think.
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