Realize that we're talking the companies as a whole, here. Sony is a company that does business in arenas outside of the game industry, and because of its involvement in consumer electronics it takes in eight times the revenue as Nintendo. Yet, Nintendo, with its mighty Wii and DS, is now a more valuable company to invest in.
For the curious, the market value of Microsoft is something in the neighborhood of $282 billion, which is around 5 times that of Sony or Nintendo.
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Originally posted by: KDR_11k
BRIEFLY. It was only for a part of the day and went back down at the end so it's not higher now. However it's still impressive for a "small" company like Nintendo to get this close to a giant like Sony.