I was thinking about my previous phones the other day, and I really miss some of the more innovative ones from HTC. I think the Startrek was my favorite - a Windows Mobile flip phone with a "dumb phone" keypad. The myTouch 3g might be next - Android with physical buttons and a trackball(!)
Phones have gotten faster, but they keep getting bigger, the battery life is rarely more than a day's worth of use, and the "premium" ones keep getting more expensive - while simultaneously loosing features like expandable storage and the headphone jack.