Does NEC 2010 allow the use of panels without copper bus bars?
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What would they be if not copper?
(Though I would guess they'd allow anything that can pass the tests to be "listed". The requirement is that the bars carry the current and be able to make solid connections with the feed wires and with any suitably listed breakers. It could be conductive plastic if it passes the tests.)
The NEC doesn't care what the bars are made of; they could be made of manure for all it maters.
The NEC does require the panel to be 'listed.' Companies like UL have their safety-based performance standards against which they test the panels, and -again- as long as the panel doesn't present a safety hazard, it matters not what materials are used.
The manufacturers have their own standards, and those are a bit more specific as to the materials to be used.
Copper busses are pretty much a historical oddity these days. It is very common for tin-plated aluminum to be used.