fireb0x

You should have already recieved an email from Amazon about it. Here is what mine looks like. The subject was "Your Bonus for Ordering "Killzone 3" at Amazon.com" and the body looked like this:
 

I know you already did a round of adds, but please add me as well! I have been playing the bet and will be playing on day 1 for the foreseeable future!

YES! Here is a link. I came here to post this also. HURRY!
 
 http://store.steampowered.com/freeportal/
 
Free for both Mac and PC and yes, the mac client is now available.

The audio file puts these letters out: 
 
M (or N) - O - D - Z - Z - Z - J - M (or N) - Q - R - Y - D (or B) - 3 - F - R - P (or E) 
 
I tried matching up those letters with the numbers you gave that were embedded in the mp3: 
 
 00000000 00000210 00000825 000000000037474B 00000000 0016FDA0 00000000 00000000 00000000 00000000 00000000 00000000  
 
If you count "0", and skip the letters that appear in both the embedded text and the audio, you get a matching number of letters and numbers (9). 
 
I tried matching them up in order of appearance and then putting them in numerical order, but got nothing. I also tried just putting letters into the numbers based on when the letters came out. For instance "o" would go in place of anywhere the number 2 came up because it was the second letter to be said.
 
Maybe this will tip something else off though...