I have a 2008 Limited and it didn't whine when I got it but around 7K it started and is most annoying. I took it in for service and got the same response as many of the posters have indicated. The service guy at my dealer said "yup, its the fuel pump, they all have it. Its normal. Have a nice day"
My family avoids riding in my car because the noise is so bad. Its there all the time, you can even hear it with the radio on unless it is turned up quite a bit. I went from telling everyone that asked "how do you like the Edge" that it is great, to, if I could sell it for what I owe on it I'd dump it in a minute.
I'm now looking for the customer service number on the off chance that someone will eventually admit there is a problem. By the way, I just got back from having the oil changed at the dealership and saw the service mgr that said it was normal last month and asked if anyone else had complained about it and he said "No, we have not had any complaints other than yours". I guess Ford is doing so well that they don't have to worry about unsatisfied customers.