Most useful (if you go through the whole thing) is some down-to-earth advice as to which protocol is best for which device.
One example is with printers, where they mention that a 15 ppm USB printer cannot take advantage of USB 2 speeds, so don't pay extra for it when shopping. Faster printers can take advantage of the newer standard.
Also, I was a little suprised to learn that USB 2 only supports a total of 100mA of power (500mA for 1.1); obviously a powered HUB and brick-powered perephrials are required in many cases.
Not mentioned is the USB speed limitation for any single device (to allow more than 1 device to share the bus) which is much less than the maximum USB rate.
For example, DV requires 3.6MB/s of uninterrupted bandwith for proper transfer. Stutter was noticed playing back video in the article, pointing to an inability to provide the required bandwidth without interruption over the USB 2 bus.
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