you cannot live without a charger everyday.

maybe maemo.org ist not the most unbiased place to ask about the N900

imho the most differences between iphone and N900:

N900
+ multitasking
+ opensource
+ camera
+ IM integration
+ hw-keyboard
+ screen resolution!
+ IR Transmitter
+ FM Transmitter!!!

Iphone 3GS:
+ weight
+ height
+ appstore
+ battery life