Best Buy (NYSE: BBY) captures one third of U.S. consumer electronics sales, according to the Wall Street Journal (subscription required). That's the good news.

But now Best Buy is losing market share. You are probably wondering why this has happened. After all since Circuit City evaporated into bankruptcy, you would think that Best Buy would be king of the hill. Not so. Other trends are developing that are eroding Best Buy's territory. Here are a few them:

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