What are you guys talking?!?!?
I've already said, but I say it again... the best wired earphones with built-in microphone are the SENNHEISER MM50 for iphone, they actually work fine on the HD and are fully compatible with the HD. Voice dialling is also supported
If any doubts, what the original earphones from HTC that come with HD does, this one also does.
Motorola CD930 -> Nokia 8210 -> Nokia 3310 -> Nokia 6310 -> Nokia 6310i -> Nokia 7650 -> Nokia 3650 -> SonyEricsson P800 ->
Qtek S200 -> HTC Touch Pro -> (SonyEricsson k800i) -> HTC Touch HD ->HTC Desire HD -> Samsung Galaxy SIII (current):