High priority items:
FIX NOTIFICATIONS
Better App organization tools both on the phone & through iTunes
Mid to Low Level Items:
Background/True Multitasking
In re: Background/True Multitasking on the "whiners" (both pro & against), everyone does realize that this is an EVENTUALITY? Right? So those who are so "against" it, might as well prepare for the future.
My proposed solution isn't Spaces (I abhor Spaces on Leopard, hate it), but Expose. To me, this makes the most sense on the iPhone platform to iconically and metaphorically represent tasks in a touchscreen environment. Spaces doesn't make sense b/c it's about app or space organization, where as Expose has *always* been about app *management*.
So, I'm going out on a limb here, in the EVENTUALITY that Apple introduces Backgrounding/True Multitasking I bet it will be visually represented in iPhone's version of Expose. I'm putting my money down on that.
Finally to those who are "pooh-poohing" the idea of Background Apps b/c it only benefits music apps? Wouldn't be nice to have MORE THAN ONE EMAIL OPEN? That's just one of many.
Long Shot Feature?
Custom Shortcut Gestures. I'd love to be able to create a custom gesture that I can use at any time to launch a particular app or do a particular task. Yes, even when the screen is in "locked mode." Heck, lets' go further than that: why type a passcode to "unlock" the phone, when it would be more intuitive to custom create a unique gesture to unlock the phone. The benefits? You can do it blindly & you are not restricted to a 4 digit code.
w00master