This is wonderful.
Called HTC for the third time. They put me on hold, then came back and told me that, because the Bluetooth connects, and I am able to hear part of the conversation, there is nothing they can do!!! They said they cannot guarantee Bluetooth will work!!!
Can you believe that???
"Hey, buy our products. we just can't guarantee they will work!"
Great business philosophy
So I proved to them it is their product at fault and not the different ear pieces I've tried. And it only started AFTER Froyo.
And they basically told me to go frack myself.