I second that. I love my iPhone 4, but the proximity sensor problem causes me to accidentally mute calls, call random people in my contacts list, etc., etc. It is beyond frustrating and I'm surprised there hasn't been a greater mention of this.
yea, while the antenna is arguably theoretical/subjective (apple: faulty formula / world: rdf?), the proximity sensor is very real and affects calls now. i too am also surprised people are focusing on antenna and not proximity.
There is a lengthy thread on Apple forums about this issue, with no resolution: http://discussions.apple.com/thread.jspa?threadID=2475509...