WOW! I thought I was the only one. I took a rather long flat head screw driver and placed the flathead end of it on various pulleys and pumps on that side of my engine, then put the handle up to your ear. It's amazing how it amplifies the sound. The majority of the noise was coming from my idler pulley. To my suprise and joy, I found that a new idler pulley is only $10 and all you have to do is take of the drive belt and remove the bolt in the center of the pulley to swap out. Easy fix.
