We are employing a bottom-up approach to build our rails app. We also do know of a bunch of open-source rails based cms solutions available. But how do you decide what is best for you? Can you comment on the trade-offs?
I've made this mistake four times now (Zope, Plone, OpenACS, Joomla). I think I might have a learning disability that prevents me from ever accepting that the "free" functionality is not worth the cost of the increased complexity of the system.