I have to say it's N93/N93i's form factor. To me it's the best. I'm a super fan of N93i, just because of it's form factor. I have used N81 and N85 for couple of months finally I changed back to old N93i which only support 2GB cards and small ram. Just because I love it so much, it can do everything, with the most comfortable experience, if it had the hardware of N95 or N82...
I will keep using N93i until its successor appears. Nokia blog says earliest 2010 it will be upgraded, I hope it's true.
I think it depends on what you want. I have owned an i-760 which was immensely practical, * an Omnia which was great for viewing the web. I saw the consensus from the compiled reviews at HDomnia were not to critical of the i8910's large size. In this case the phone large footprint seems justified by the large screen. It is always a balancing act...
I simply dont understand why a D pad isnt placed on the bottom of the touchscreen phones and 2 buttons at the top. This would take up little room, allow touch and d pad to be used and it would make mobile gaming a reality. You need a d pad and button for games, why havent Nokia got that!? Fiddling about with buttons on the keypad (ie for fifa) just doesnt work.
Revo Phone with customized linux distro, 3G, Wifi, flash, SD card slot, replaceable battery (slim and fat), OLED screen, phone buttons on cover with second small number screen.
would pay 600-700 for it.