Josh, as it is with round cells, matching cells in a pack is only useful for a limited time, and its usefulness is inversely proportional to how good the manufacturer is. How good the manufacturer is is proportional to time. So, here in late 2006, any decent lipo pack is adequately matched.
Far better than matching is the ability to balance. All decent lipo packs have balance connectors. Balance once every 10 cycles and your lipo pack will be performing at its best.
BTW, the RC car guys have a big advantage here. The RC airplane and heli guys have been pushing lipo technology very hard for the last three years, and the result is that RC car guys start with great lipos.
When someone is intent on excelling in an otherwise laudable manner, does he not desire to inflict pain on others by means of his exalted status and enjoy the envy he arouses? Is there not an anticipated delight in an artist's ability to defeat his artistic rivals, which heightens his euphoria in creation?