I've got an iPhone and a N800. There's no comparison. I haven't touched the N800 since getting the iPhone.

The screen is two to three times brighter and readable in sunlight. The screen fonts are very readable and contrasty. The ability to zoom in and out quickly is amazing.

The OS and interface is like something out of the future.

Web browsing is much faster and easier than on the N800. The "reverse pinch" and double tapping on an area of a page work great. Even though the screen is smaller, the overall experience is better. I find myself wishing i could zoom in and out like that on my laptop.

Apple just gets it. They know what people want. And the interface doesn't get in the way.

OK, it's not perfect. The EDGE network is s l o w. . . .
The mail app needs spam filtering.
It's expensive.

But, I bet it sold more units in the first 24 hours than all of the N800's ever sold.