I used to use an Ipod. And then as soon as Nokia smartphones started offering the standard 3.5mm headphone jack, the ipod got replaced, and I've never looked back.

My N96 was awesome, it had dedicated media player controls.

The N900 still is an MP3 replacement for me, but I have come to the realization that it's not as good as previous N-series smartphones' mp3 capabilities, in some regards... But I still enjoy listening to music on it... as I text and email people... and check professor's notes and solutions pdf's all at the same time