Probably right wheel bearing.
Jack up the car. Place on jack stands.
Grasp wheel at 12 and 6 o'clock and push in and out. Any movement, most probably suspect wheel bearing.
9 and 3 o'clock - tie-rod/ball joint.
Wheel bearing how to in Duratec Maintenance FAQ
http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=v6maint&Number=958650&page=0&view=collapsed&sb=5&o=31&fpart=1
