Seeking further enlightenment, Harry Jacobson-Beyer followed-up with:
Does one of them have to be a powered hub if they are not daisy chained?
Here's the method I've been using to decide how to connect USB devices.The USB 2.0 specification says that 500 milliamps (mA) of current should be available from the root hub inside your computer. This probably means the sum of the current needs of all your devices plugged into both USB ports must fall below 500 mA. Unpowered hubs draw their current from the USB port into which they're plugged, so they have to be part of the calculation.
This 500 mA is the top end of the power that must be available. I usually try to stay well below that level. If you're lucky, the power needs for a gadget will be written somewhere on the spec sheet for the device.
The unpowered hub I've got takes 100 mA all by itself, so using two of them is probably impractical. A powered hub takes essentially no power from the USB port because it gets its power and the power for all the devices plugged into it from its wall wart.
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