“small enough to carry with you on runs”
I run every day and always wanted an iPod to be on me, except they were the older bulky ones, or the fragile thin plastic type. In the newer nano, with a metal casing on front and back, I don't feel like this will get damaged, or take on moisture if its in my pocket. I also do like the size being very thin and wider so it can fit on an arm band. I don't use any other iPod to run with and have been satisfied with the current model. One thing I found poorly designed is the wheel that you use to scroll through menus. It is a smaller iPod but the wheels tiny radius is difficult to get used to.