I too would like to see an all-in-one dock that holds both - preferably at the same time. It's probably just a matter of time before Griffin or Belkin come up with something.
While I don't disagree with your wattage quotes on the 2 devices when using the power plug, but you can dock your ipod / iphone to the dock for the ipad that attaches to your computer. I dock my touch to my ipad dock all the time. You are getting the same wattage from the computer USB port. Granted, charging the ipad takes a while this way, but it works for me. My battery seems to last forever on the ipad.
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