Although I do see the value of the PS3 as a Blu-Ray player, unless you have an HDTV there isn't really any advantage over the 360.
Just take a look at the game reviews on Metacritic - the Xbox360 so far is kicking the PS3's ass when it comes to quality exclusive games, and, when it comes down to it thegames are what matter. Publishers will rather push their games for Xbox since a quality game is nearly guaranteed to sell a million copies, whereas the PS3 and Wii are mostly owned by people who want a console for the sake of it, not really to play games. Any non-Nintendo games on the Wii bomb, so no one wants to risk putting money into a game that most people won't buy because they only bought the console for Wii Sports.
I'm not saying that if you own a PS3 you bought it just because of the brand, just that a majority of the sales are for exactly that reason, and the developers know that the 360 is always a better bet to sell your game as the owners tend to be more informed, hard-core gamers.
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The man chooses. The slave obeys.