LOS ANGELES ( TheStreet) -- Nintendo's still on top heading into the Electronic Entertainment Expo (E3) on June 15 to 17 in Los Angeles, but plans by Sony ( SNE) and Microsoft ( MSFT) to knock Mario off the mountain are in motion.The state of gaming in 2010 is oddly similar to that of last year -- sales down, with Nintendo products crushing all opponents. At the end of 2009, video games generated $19.7 billion in U.S. revenue, according to figures from NPD Group. That's not as big as the amount Americans spent on personal computers ($28.3 billion), but it's similar to revenue from flat-screen TVs ($21.7 billion) and dwarfs U.S. box-office receipts ($10 billion) and the market for MP3 players ($4.8 billion). It's also, however, down 8% from the $21.4 billion generated in 2008 and down more than 10% in the first four months of this year.
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