I FOUND IT!!!!!!!!!! Or, maybe, I should say my dealer found it. I was having this famous "ticking" or rattle, and it seemed to be coming from the dashboard. I tried to find it, could not. So, as a last resort I took it to my dealer. They found it in about 10 minutes. IT WAS NOT IN THE DASH! It was the inside rear view mrrror!!!!!!!!!!!! They changed it out (under warranty for my 2008 Edge), and now my Edge is blissfully quiet. Great dealer and fanstastic technician.
I hope this helps you guys find you rattle.
S