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@Dammit
The nice thing about this (apart from satisfying your washing machine) is that the resistance curve is linear- and rises progressivly with wheel speed.
So, for example, 20 mph equates to ~300 watts, whilst 18 mph is ~270.
Which means that as long as you can measure rear wheel speed you can get a pretty decent idea of how your training is coming along.
Wheel speed on a turbo is generally meaningless, power output on the other hand is extremely useful if you are following a structured training plan.
And if George is correct, your washing machine might stop eating half your socks.