I agree with the above statement. In fact, before I even had my callback at one of the large firms, the recruiter even told me up front that they had abandoned the rolling offer dynamic so they could get all their hiring done before october. She said they would issue their offers the first week in october.
From what I gather, this is becoming more and more common. While the proposition of NOT hearing for another two weeks sucks, atleast I know they haven't dinged me just because of the passage of time. Then again, the longer I have to wait, the more crap will soak into my pants. So, you know, plus and minus.