Just wondering where I should start with this:

When I am driving at slow speeds (<25 mph) I can hear a squeaking noise coming from the front wheels. It seems to be rythmatic with the rotation of the wheels at slower speeds, being somewhat intermittent. Oddly, it stops if I press the brakes and can only be heard when I'm accelerating or coasting.

It sounds similar to brake pads squealing, only opposite, as it does not do it while braking.

A visual inspection hasn't turned up anything. Has anyone heard of this?

 

Don't have an answer, but what I would do is take a can of WD-40 and spray it liberally in the front wheels. Sometimes the simple solutions work best.

 

If the squeak stop when you lightly apply the brakes, then it is probably brake related. Inspect the front brakes.

 

If your pads have wear indicators (and not all do), a squeak that goes away when applying brakes is the symptom for nearly worn our pads.