In a message dated 4/22/2011 8:56:17 P.M. Eastern Daylight Time,
clark10006@COX.NET writes:

It  is a deep hum that seems to be coming from the driver's front wheel
well
area.  I feel a slight vibration that accompanies it.  I  don't hear it/feel
it under about 25 mph and it does get a bit louder as I  accelerate.  I
definitely hear it/feel it when I am veering to the  left and not to the
right. (over 25)  I don't hear or feel anything  when I slow down to make a
turn or when I'm maneuvering at low speeds.  (Backing up/U-turns)

bad wheel bearing.....?