I will sell my N900 the day someone shows me how to hook up my wifes 3GS to the tv or stereo (FOR FREE) and without risking the wrath of Apple so we can play divx movies from it onto our tv in the comfort of our living room as easily as the N900. Also if someone could please show me how we can stream internet radio through our surround sound speakers for parties without having to buy more iphone accessories to do so. Yeah, the "pocket pc" aspect of the n900 damn near makes it unbeatable, but a jailbroken iphone can hold a small candle to it (until you want to copy/paste some text from one app to another among other things).
However the multimedia aspects of the N900 blow every other device away hands down.