I get quite different numbers.
Let's start with the average cost of electricity.
I took a weighted average 6h peak, 6h mid-peak, 12h off-peak and got an average cost of 8.1 cents/kWh.
Taking into account the weekends, this gives 7.557 cents/kWh.
The PS3 uses 0.115kW, so 115W*24h/day*7day/week=19.32 kW/week.
Multiplying the energy use by the cost/week gives $1.46/week.
Not that bad if you ask me.
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