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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