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I feel i am compelled to respond to a nit with a nit , hah ha. re:

Here again i agree. My T-Mobile Wing's hard key layout and D-pad has been the most ergonomically useful and hence fastest phone to use of any i have ever used in stores, trying out friends' stuff, etc.

I had its predecessor, the MDA, and the Wing completely became an ergonomic pleasure to use. whether I used my left hand or my right hand, the additional hard keys on sides of the phone, plus the bottom of the phone, hit exactly in the right spots re hands, finger, thumbs. And though it was mostly a remake of the MDA (both HTC phones), the Wing nailed it for me where the MDA was, pardon the expression, a piece of crap for me, though also my first touchscreen phone.

So, once again i hear ya re the relative efficiences of using dpad and dedicated hard keys that can be reassignable. My "OK" button map mapped to the top right of the phone where the defauilt Comm Manager button was -- and when holding in my left hand, my middle finger was right there on it. Same finger could slide down just a bit to hit the other dedicated button, which i mapped to voice recorder, since I recorded audio notes frequenty.

My thumb was on the camera button which i remapped to Start menu. Sliding my thumb down to the D-pad was smooth, no bumps at all, and instant recognitoon even in the dark what the functions were and so easy to press in quad direction, then click enter/center. Similarly the ergonomic design of the Call button and end button, and the 2 additional keys around each, was just the height of ergonomic perfection. No way of mistaking which key was which, yet a slight shift in any direction and the desired key was hit perpectly, and not requiring a lot ofpressure.. just the right amount, plus tactile feedback with hardware clicks for certainty of entry. The okay button doen there by the end call i remapped to "Today", which always made home screen 1-click away for times when an app didn't have an easy-access close-button.

Im used WKtask -- which not enough people use in my view.. one of thebest UI utilities besides QuickMenu... my thumb could easily arc to top of the taskbar to tap an icon to switch tasks, or press-hold to end any app, or minimize any app, thus guiving me extra manual control over memory management, and closing apps, or quickly switching to them.

Sliding out the keyboard was so simple because the left fingers wrapped around the device were already positiioned to push the top screen to reveal the keyboard. Everyuthing fit in the hand perfectly...

Which leads to my last comment... I love my new HTC Hero for its size and ergonomics.. I have not used yet some of these new larger screen devices but if the WING and the HERO fit perfectly into my hand in its natural resting position of fingers, then it seems logical to guess that larger device require a wider grasp -- even if miniscule, which activates all sort of other micro-muscles in fingers, thumb, and palm of hand --

I am guessing there will be not one person who will ever fess up that a larger device results in some slight or more-than-slight greater muscular fatigue of the hand and repetitive stress.

So even though you're focus is on WM6 - THE KING! -- my focus is on how HTC learned to optimize the controls of WM6, making the WING, for example, a phenomenal exmaple of product design.

Now since lots of HTC devices held similar footprimnts, maybe lots of HTC devices had the same kind of ergonomic optimization as the WING, prob so.

I can just speak to the wing.... So, there is no way I would credit WM alone for the usability "sweet spot" you have liked. Without great product design, you'd have tossed your phone in the trash long ago. We'll never know that for sure, so I can't bet you on it. But i would if i could. :)

thanks again for a truly rare discussion about human usability vs whiz-bang. Way too little of the former occupies this site, way more the latter dominates the site.