Domaineer

Domaineer was developed to provide a way to easily manage domain-specific settings and placeholders. This means that if you have one context that can be accessed from a number of (sub)domains, and each different "point of entry" requires for example a different logo, site name or other non-resource, non-context and non-user related setting.

So basicly, you can set a different [ [ + + site_name ] ] placeholder (or any) per domain that accesses your context.