Man, this is driving me crazy!

A couple of days ago, a loud, annoying squeak started in the rear of my car. Checking it out later, it clearly sounds like it's coming from the right, rear suspension, near the top. It squeaks when I go over bumps, or rock the car. I opened the hatch to make sure that wasn't it - although I fixed that rattle already (thanks to the forum).

Anybody run into this? A bushing or something?