Hmm. I think that N900 should be treated more or less as computer. I still have my 5 years old laptop and pentium 4 desktop machine and they still make everything that i ask from them. Actually after browser speed race they have become more useful to me.

Maybe we are just different breed :P

.edit
Before this I had Nokia 6021 which doesn't have GPS, Camera, mp3 player. Had that for about 4 years and still happy with it. Actually it's much much faster as phone than my N900 :P