Mystery noise?

[unbwogabl]

Here's a stumper: At low speeds, my fiancés car makes gentle vibrations, that can be felt in the steering wheel, as well as throughout the vehicle. They seem to be directly related to tire speed, not engine speed (I've shifted into neutral and revved the engine to be sure). At 40+ MPH, it makes a howling noise (constant, not really a thump, more of a whir), that sounds a lot like wind noise, but is loud enough to drown out the radio at low volume. Again, related to tire speed, not engine speed. The noise seems to be coming from the front, drivers-side area. But, as SOON as I touch the brakes, the noise instantly ceases, even though I'm NOT pushing the pedal down far enough to actually stop.
The vehicle in question is a 1997 Chevy Cavalier, 110K miles, 2.2L engine, (of course) 4 cyl, automatic trans.

I've checked front brake rotors and pads on both sides, and drums and pads on the rear. They have plenty of material left, and do not appear glazed or pitted. The wheels have little or no play, so I don't believe it is a wheel bearing. When I shift into neutral and allow the engine to idle, then shift back into gear, I don't hear a thump, which would indicate that the CV joints are unrelated (I would assume). The wheels do not appear to have lumps or bumps, or be out of balance. It handles quite well, aside from the noise, I just can't for the life of me figure out what the danged noise is! Any suggestions?

[Blue Bowtie]

Warped rotor? Hard/annealed spots?

[shakewell]

It sounds like a wheel bearing to me. And, yea, I know you checked the play but it still could be going bad.

[unbwogabl]

Something else I noticed, if I make a right turn, the noise stops till I straighten the wheel. However, left turns don't have this affect.

[shakewell]

That's a wheel bearing, alright.