[K-Wall]

If you sign into the admin panel of the grandfathered domain you can add the new domain to that Google Apps Account.

Granted any settings will effect all the domains associated with that account.

[patrickdavey]

I realise HN doesn't like people saying 'thanks, me too'... however... in this particular case I just wanted to say "Thanks!!!" ... I'd not realised you could do this and I'm now 5 minutes into migrating a few domains across. Brilliant.

[grecy]

ohhhh. Now that's good to know! Thnaks. I'll be doing that right now.

[tiagocesar]

You, sir, are a real hacker :)