I have accumulated a number of PlayStation 3s, most of which with dead lasers, other than that nothing wrong. Now, with that said, I know you can only get ~80Mh/s out of one, but what if you were to cluster? Have them all operate as one computer? either GPU-wise or CPU-wise? would it be worth the power drawl?
It's just math.
Say your electricity costs $0.10/kwh. A PS3 draws 120w when mining. It'll use 87 kwh/month in electricity, for a total expense of $8.70/month. You could currently mine about 1 BTC/month with 80 mh/s, for a total revenue of $11.00/month. So, you make a whopping $2.30/month per PS3 for your trouble.
Basically, no, it's not worth it. Not in my opinion at least. Also factor in that difficulty is continuing to increase, so it'll soon become unprofitable entirely.
If you have really cheap electricity, then it might be worth it for a while yet.