Wow, I did not get that letter but then again I have sent my application about a month and half ago. It is nice to see that USCIS actually sends these kind of notices.
__________________
Application Sent:
8/22/12 via USPS Express
Application Delivered:
8/23/12 Signed by JC
Email and Text Received:
8/28/12 at 11:29am
Notice of Action Letter:
8/31/12
Biometrics Appointment:
9/28/12 Walk In:
9/18/12 EAD Approved
9/28/12