[MetroMPG]

Sounds like a wheel bearing to me, based on the sound changing as you load up that wheel in a turn.

Guess #2 is simply the brake backing sheild touching the rotor. EDIT: but I can't see that changing pitch so much when you turn.

EDIT2: if it were a wheel bearing going, that could also seem like a sticking brake when rolling the car. The reason I'm familiar with wheel bearing problems is because the ForkenSwift has had a noisy front right bearing since we got the car. It'll get fixed sometime in May.