Earlier in the thread someone mentioned that after some optimisation they were able to get ~20MH/s from a PS3. Under load the PS3 uses in the range of 100-200W. To put that into perspective, an Antminer U1 has nearly 100 times the hashrate, consumes ~2.5W - and each is only worth a few dollars, because their hashrate is insignificant at this stage. It is a complete waste of time to talk about PS3s for bitcoin mining.
Any CPU coin miner for PCs would have to be rewritten specifically with the PS3 in mind, and nobody is going to bother because the Cell would be significantly outperformed by most modern CPUs.