Chris Rawson at TUAW:

For the same price as last year’s iPod nano, you get a much smaller device with a new multitouch-based UI, but you also lose many of the features the old model had. That’s form over function all the way, and it’s just as bad, in its way, as Apple getting rid of FireWire on its MacBooks. It’s the same principle at work: once you intro a feature, you’d better have a very good reason for taking that feature away in a subsequent model, … and “Gee, look how small it is now!” doesn’t cut it every time.

The whole thing still perplexes me.