Here’s this summer’s new Incase armband for the second generation nano. I think it’s really good. It’s transparent cover lets you read the ipod’s screen and access all its functions. Simple and practical.

Fully adjustable for universal fit, washable and reflective, the Incase Sports Case armband lets you practice sport using your ipod nano in complete comfort.
On the other hand, it’s impossible to fit the Nike+ Sportskit inside.
It’s also available in pink.
You can buy it from the Apple Store for $29