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Apparently mine does the same thing. This was on high idle but you can plainly hear it with normal idle also. I thought it was my tensioner pulley but when I lifted the hood it was readily apparent where the noise was coming from.
Two tensioner pulleys and a serpentine belt later mine is a lot quieter. I think I still hear a weird little noise but I may be paranoid now. It only happened when the temps were colder. 7800 miles on it now.