I have a 2005 Pilot with 60000 miles on it. Recently when I start it in the morning I hear a high pitched squeaking from what I think is the idler pulley or other pulley on the front of the engine. Any idea which pulley it might be? Or if it may be something else? It does seem to stop as the day goes on.

 

you are probably correct that it is an idler pully, it will go quiet, but some time in the future it will lock up. If you have a stethescope ( mechanic's) you can put the tip of the probe on the pulley area and detect exactly where the squeel is coming from.