I recently applied for expedited processing.  The process was surprisingly swift and pain-free, albeit unsuccessful in my case.  What I did was I called the USCIS hotline at (800) 375-5283 where a very friendly officer put my application into the system.  The next day I got an email that confirmed my application and asked for additional information and proof to be faxed to (816) 251-2290.  A day after I faxed the evidence I got an answer by email: "While your situation appears serious, you have