I think it's a safe assumption that the Reader is a minor portion of overall revenues, even in contrast to the rest of its electronics business such as televisions, computers, audio players, gaming, etc. One can also see that from the relative advertising budgets.
I bet the first Walkman was also "insignificant" revenue for Sony. We have seen reports that the Reader is doing much better than anticipated. All indications are that Sony considers this to be an early effort in a coming market, and there's no reason to think that sales will slow anytime soon. One good sign is that there seems to be a disproportionate amount of interest in the Reader, and it is doing amazingly well relative to metrics like returns, customer satisfaction, etc.
But it may be quite a while until we hear Sony talking about a book device as being a revenue or profit leader. Things like video games, tvs and computers are likely to rule the roost for a long time.
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