I wish touchscreen phones would still have the green Call button and the red End Call button. After all it's still a phone, even though I barely use it as a phone. I just think it would be a more robust design to have those buttons.
I also think it would be great to have hardware buttons for the Home, Menu, Back, and Search buttons. I have the Droid Incredible and the touch buttons are pretty accurate, it would be even more accurate as hardware buttons. I bet it's cheaper to manufacture with less hardware buttons.
Also would like a dedicated camera button. I think it's used often enough to warrant a button.
A bonus would be to have play/pause, ff, and rw, buttons that you can bind to any music player app.
Oh wells, I'm still very happy with my phone/tiny pocket computer.