* Domains + sub-domains allows for wildcard SSL cert registrations (e.g. a cert that covers .example.com).
There's also cookie registration.
* How do I differentiate between my_blog_host, my_blog_host_2 and really.my_blog_host? Are they all owned by the same person? Is really.my_blog_host associated with my_blog_host?
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Of the top of my head:
* Domains + sub-domains allows for wildcard SSL cert registrations (e.g. a cert that covers .example.com).
There's also cookie registration.
* How do I differentiate between my_blog_host, my_blog_host_2 and really.my_blog_host? Are they all owned by the same person? Is really.my_blog_host associated with my_blog_host?