Like Ammeck09 said in his earlier response the affidavit of support (AOS) doesn't have to be notarised.
My sponsor had the AOS notarised. He added a copy of his tax returns for 2008, a letter from his employers and a copy of his bank statement. I asked him to put the AOS with the supporting documents in a sealed envelope adressed to the embassy. I thought that would make it look more official and professional. The lady who inspected my documents at the embassy asked me to open the sealed envelope and bring out the contents. She first took the AOS followed by the supporting documents. I hope this answers your question.
My advice to those yet to go for their interviews. You don't have to worry if you don't have an AOS. There was this guy who didn't have an AOS, he didn't even know what it was when I asked him if he had one. He was also asked to come on the 2nd February. The consular officer didn't ask him about any AOS. He was told they were doing some checks on his documents and that he should come on the 2nd.
I think it is better to be well prepared than to be asked to come back in another day to submit additional document(s). I know a lot of winners who was asked to submit AOS after having their interview.
Last year my sister in-law was asked to submit the AOS after having her interview. When she submitted the AOS together with tax returns for 3 years, they asked her again to get tax transcripts before a decision is made on her application. Thank God she got this doc too and was given the visa later.
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