Linguaplone aims to be *the* multilingual/translation solution for plone, and achieves this by being as transparent as possible and by minimizing the impact for existing applications and plone itself.
it utilizes archetypes references to do the translation, and all content is left intact both on install and uninstall - thus, it will not disrupt your content structure in any way. it also works with webdav and ftp.
linguaplone doesn't require a particular hierarchy of content, and will work with any layout of your content space.