I just ran out to my local Apple Store and bought a black 4GB nano. Why black? Change of pace.... I like white, I like black, and fingerprints aren't really an issue as I keep the pods as clean as possible as often as possible.
Short review: the "feel" is fantastic, sound seems on par with that of the Shuffle (marginally better than disk-based iPods I've had or listened to), and the screen is great. All in all, it's not as good feature-wise as its big brothers, but I think it is a very worthy mini replacement, and, let's face it, if 6GB is enough for you, 2GB or 4GB likely is as well - you'll just reload it often (like with the Shuffle).
Minor issue: as mentioned, everything else is white. Black headphones would have been cool, but my B&Os fit the color scheme nicely, so I won't be using the stock phones anyway.