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They probably got approved for the account under a different domain. Once you are approved, you can put your code on other sites your own.
ganderla, yes I realise that, I have a few sites myself. I was wondering if it actually was a violation of the TOS.
Of those, I have usually had AdSense on anywhere from 30-60 pages, as I try different things out...
That original site I used to apply for my account practically gets no income at all because I haven't had the time to improve it. But it is still active.