The lights are on
Xbox 360 has better support for multiplayer, particularly shooters. Otherwise it doesn't really have much of an edge over a PS3. In many ways it's inferior, examples including fewer exclusives and lack of a free Bluray player.
Before anyone accuses me of being a Sony fan-boy, I don't even own a PS3. I do own a Xbox360, however, so I feel I can fairly criticize it without bias.