The HTC HD2 is not officially on sale at T-Mobile yet, but this user got one early and unboxed it on video. JDMiPhoner managed to pick the HTC HD2 up at his local Walmart a full 4 days before its Wednesday release. He was an avid iPhone user before but seems pleased with the HD2.
The HD2 looks a little thinner than the iPhone, but a little taller. If you're into Windows phone this one looks pretty sweet.