The official documentation is at: http://docs.alfresco.com
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Any Space structure can be used as a template to create a new subspace, or even as the starting structure at installation. The latter option would allow us to have an eRoom-like installation option, or SharePoint, or any other organisation that is dreamed up.
Templates can also be used in the same way as Room templates in the demo: when you create a any new Space you will be given the option of basing it on a template (e.g. a marketing project for a new product).
Where templates are stored needs to be decided, but should be the same as for Content Types, Classifications etc., in other words, in a standard 'corporate' place as well as personal or team locations.