The worst plug design I've come across. The team that approved the design should be ashamed. It is easy to try to plug in upside-down, and impossible to tell the difference in the dark or if you are pluggin in by touch.
USB B is much better, the difference between square and cut corners is easy to feel in both socket and plug, and it doesn't almost go in if you have it wrong.
Why are A/B different to begin with? Allowing for different form factors allow you to keep up with the times, eg mini-usb ports on cell phones and other tiny devices. And certainly A is an easier fit into the edge of a powerbook than B. But I suspect the standard of A on hosts and B on peripherals was adopted so that people were less likely to plug in hubs the wrong way. If the host, hub, and peripherals all used B then the user would have to pay attention to the routing, the ins and outs. But because in/out ports are differentiated by shape, it is impossible to connect peripherals through a hub incorrectly.
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