I have an ipod touch, and I also have a sony walkman mp4 and a Sony Erricson phone with mp3.
The ipod is head and shoulders above the other two, simply because of the range of applications, I haveall of my doctor who series stored on there, some films, music videos, hundreds of photos,hundreds of songs, games, facebook, the list is endless.
It is the gadget that I use the most, it is also very simple to use and itunes is also very easy to use.
I could not be without it, I carry it with me along with my two mobiles, it takes up little room in my bag.
It was a pressie for xmas last year and I have used it just about every day since.