The resolution itself is not that important imho. We already have quiet a few resolution, and know, it must work on a small screen. The Normal 3:4 Basic UI is a little bit too small for the size of the n810 display. I am really only talking about display sizes, not resolution, as I am pretty sure, a solution that works on an n810 size wise, will work on an iPhone/iTouch as well. The screen might not look as good on the Apple stuff, but that's the price you pay for having a nicer case (and I prefer the Apple logo over Nokia logo
Having said that, we come back to the need for a consistent layout across ALL UI1 based orbiter imho. Right now we have Basic that has been consistent from SmallUI to Normal 4:3
A new skin needs to be consistent for all of the devices as well. I started with a SmallUI replacement, but quickly realized, that it does not make sense, to have a new Skin just for SmallUI. It irritates the user a lot, seeing two different skins for the same interaction.
Just my 0.02EUR