The new 2nd Generation iPod nano is different from it’s predecessor.  With 24 hours of playback time and an aluminium casing, these changes are in the rigth direction as well.  Ars Technica can tell you all about it.
“Only a year has passed between Apple’s introduction of the first generation of iPod nano and now. With a sizable share of the flash player market at this point, Apple revamped all of its flash players last week with a new generation of iPod nanos and iPod shuffles. The second generation iPod nano line gets a brighter screen, software updates, new headphones, new packaging, and most noticably, an entirely new enclosure made of anodized aluminum. The new case also marked the return of colors besides black and white—essentially turning the 2G nano into a smaller, flash-based, color-screened iPod mini.”

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