I would definitely wait a week or two to send another one. I just talked to a man at the IRS yesterday about our 08 tax bill and I asked him if our 1040X had been received. He said they do not log them in the system until right before they issue a check and that they are so backed up because folks are getting impatient and are sending in two or three amended returns to make sure they are received.  This is bogging their system down causing these huge delays.  He told me not to call and check on the status until 10 weeks out.  I really don't get why they aren't logging in that they are at least received but I do understand their logic about not wanting folks to send in the same paper work over and over again.  Hope that helps!  It stinks that these checks are taking so long - we're living without a substantial part of our home furnished in anticipation of that check!