I notice something odd that probably no one has any reason to notice...
My sd card is full of mp3's, so often it's more convenient to plug my Treo650 into my home stereo and load a good playlist. However, I noticed a loud pop occurs everytime the screen goes off, or when I turn it on. I'm using Pocket Tunes. And what's strange is that you don't hear this when using headphones. Any clues?