I have my own Apps account and was peeved at having to create another Google account for Google+, but now I'll continue to use a "personal" Google account for Plus. This way my Google+ will never be tied down to one organization (even if it happens to be my own at the moment).
They really need to decouple a Google account from a person's email address(s).
They really need to decouple a Google account from a person's email address(s).