According to American Technology Research analyst Shaw Wu, black models of the iPod nano are outselling white models. "Our checks continue to indicate good iPod nano sales, albeit not great," Wu said in a research noted obtained by iLounge. "Black nanos are selling well, while white nanos continue to lag. We are hearing that Apple grossly underestimated demand for the $249 black 4GB iPod nano and is realigning its supply chain to meet this demand dynamic."

"In the meantime, we believe some customers looking for a black 4GB iPod nano end up buying a black 2GB nano or white 4 GB nano as a compromise," he said. "We continue to believe that iPod nano may need a storage upgrade and/or price cut to spur sales beyond black 4GB iPod nanos."