Oh, ok... Well, that comes partially from having an integrated OS that apps are specifically written for and within. You'll see that once Apple allows third party apps to be developed, the "quickness" will degrade a little -- probably not much, though, as Apple prodes themselves on high usability.

Processor speed is also a factor. But, not much... Have you used the latest version of UKMP? (https://garage.maemo.org/projects/ukmp/) Some of those smooth/quick/cool-GUI aspects aren't the device itself, but the time that developers want to spend building those "effects" into their apps.

If Nokia created some sort of uniform coding/GUI bible for devs to work off of, this might be achievable. But, I don't really see that happening anytime soon. (Maybe for the N900?)

In any regard, the current closed-architecture model for the iPhone is a little bit annoying. As a Mac user myself, I was hoping that they wouldn't go that way. So far, from what I've seen the N800 surpasses most of the things that the iPhone can do (aside from the cell part, of course).

-T.