At this point, the iPhone is a much more "complete" device.

The N900 on the other hand has much greater potential than the iPhone.

It is a question of whether you are willing to wait and for how long.

In my opinion, if the community grows and Nokia gives the support that is needed, the N900 will be better than iPhone in about 6 Months.

It still has some features now that beat the iPhone hands down (browser, keyboard, multitasking etc)