This is one of those petty details that anyone can and everyone will have an opinion about... so here's mine:
I agree with Tilmann that the term 'subsite' makes more sense to OpenACS folks. And, like Torben, I believe that this term is in fact universally less ambiguous and more to the point than is 'community'. While anyone can deduce linguistically what a subsite must be, nobody can really know what a community would suggest in this context. (Is it a sect or a permissive gathering of independent minds?)
At any rate, a subsite is not equivalent to a community. A subsite is the web infrastructure where a community may or may not evolve. And if it doesn't, this could be intended; the subsite may well be created to contain a sub-section of content or applications, rather than a sub-section of users. 'Community' is an assumptuous and non-generic term (almost qualifying as a euphemism); 'subsite' is not.
