I think you can send onlie apllication its very speed, but your need to respond to specific questions CIC:
http://www.cic.gc.ca/english/my_application/apply_online.asp?
Congrats its a good news, my application is recevied by CIC 21-05-2013 and my AOR 30-05-2013, im not US but i'm french, CIC has started to work on my file in the 29-05-2013. :)