After receiving an iPod Nano as a gift, I looked high and low for too long to find a dock that would work properly with the Nano. Even though the Nano has 30 pins, like other iPod products, something about the Nano made it impossible to use the 'common' docks. It would play just fine for a bit, then bloop-bloop, change tracks, bloop-bloop, skip tracks, rinse and repeat. It wasn't the Nano!
Love my iLuv Dock
After consulting with Apple locally, I was left with the impression that NO docks would give entirely satisfactory performance; and that the Nano was meant solely to be use with ear buds. Not what I needed to hear!
Fortunately, I discovered this sleek iLuv unit, at a very affordable price, and have had absolutely carefree operation ever since. It's a great little unit, accepts all 30-pin iPod/iPhones, and has terrific sound quality. The dock can be rotated, as it is circular, to properly display a Nano or iPhone. You can adjust it to just the position you prefer. There is also an auxiliary input.
The only con to this unit is the speak cover itself really attracts dust/dog hair. Since it's a speaker, I wouldn't run the vacuum over it, so just use one of those sticky rollers designed to remove lint from clothing and it does a great job.
Terrific unit, especially if you have the Nano!