I have sended my application on 27th OCT 2011 to CIO, i am under FSW 2 ( AEO) category, i previously applied in FEB but due to lack of some docs got NER now applied again.
I dont think is time to get the acknowlegment yet. My form was received on 24th of Oct. though it was initially returned on 21st of July cos the credit card for payment declined on two occasions, but it took over two months for the form to get to me.
You can send an email after six weeks to know the status of the application.
Wishin you all the best