I requested my first PIN the beginning of December. Never received it. Requested my second one two weeks ago, I still haven't received it. What could be wrong?
In the USA I don't know really. I have witnessed PIN arriving 3 weeks later, but it was overseas. Don't worry, you can ask a third time I think and then you can discuss directly with adsense and they'll ask for a copy of your id or something like that with your address and it will act as the pin.
First at all, double confirm that your address is correct, the PIN normally will arrive your place within 4 weeks. it shallnt be too long since you are from USA. I got my PIN within 10 days although i'm from oversea. Just wait for another 2 weeks, and re-request the PIN if you still not receive the PIN. If you still fails to receive the PIN 4 weeks after third request, then you can request for the phone verification, the details you can refer http://support.google.com/adsense/bin/answer.py?hl=en&answer=2438512&topic=1348259&ctx=topic Nothing much to worry