Do you have the PS3 remote control?
Any button press on it will turn on the PS3, and because it's bluetooth it doesn't have to be pointed at it (or even in the same room).
My PS3 was coming on "by itself" until I took the remote (which was on the couch) and put it on top of the unit. My hunch is it was getting accidentally pressed by various couch types (me, my wife and/or our cats) as we moved around.
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