The Tablet and the Color both have custom MiniUSB ports (and cables and chargers) that have extra pins to allow for faster charging. Use of other cables and chargers (including a computer) will either 'trickle' charge or potentially discharge the battery depending upon what's happening. YMMV, [insert other disclaimers here],....
It's easier for us to say just use the charger/cable in the box, than it is to provide a properly nuanced view in the user documentation, since no matter how carefully you write something like that, you will never get it quite right (and customer complaints/lawsuits etc follow).
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