This happened rather quickly.

I had new rear brakes done about 9,000 miles ago, last spring. Fine. Recently, oh about 3-4 weeks ago, the brakes started squeeling just a little at times upon stopping. Nothing abnormal.
No grinding.

However, this morning, on I-595, I started getting more squeel and pulsating squeeling - and not just during braking. Braking changed the noise, so I think its the brakes, but it got progressively louder.

I'm at work now and left the car with my better fix-it pro. It is coming from the left rear wheel.

What do you think the possibilities are?

(One more note: in the last few months, I've been gettng somewhat of a bounce from my rear between 70-80 mph, which smooths out after a while. Could this haven been related to that?)