As stated in other replies, the power necessary to run sufficient ion engines constantly would be too great a drain, however, there are other types of electric propulsion in the works that provide more thrust and could be used intermittantly. The PPM (Pulse Plasma Manifold) drive seem promising, especially if they get it to run on water as they are currently trying.
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I agree that the N-Gage is a great portable game machine. I would add Rifts: Promise of Power to the list of truly excellent portable RPGs.
As stated in other replies, the power necessary to run sufficient ion engines constantly would be too great a drain, however, there are other types of electric propulsion in the works that provide more thrust and could be used intermittantly. The PPM (Pulse Plasma Manifold) drive seem promising, especially if they get it to run on water as they are currently trying.