So 1 CPU vs 100 CPUs makes it all pointless.
How will this change once it's 1 GPU vs 100 GPUs?
How will this change once it's 1 GPU vs 100 GPUs?
Stated perfectly, thank you.
Right now there are botnets and people abusing AWS/Google (even a youtube video on how to do it).
When GPUs become widely available, it will be GPU farms.
Oh well. When GPU mining hits, I just hope there's comparable performance between Nvidia & AMD (I only got a couple of the cuda variety). Better yet, have the advantage over at the cuda camp, that would be very nice! 
Good news for you then. We are still tuning things (and we're sure the community will improve upon it once we release source), but at the moment our Nvidia numbers for high end cards are better than our AMD numbers (thank djm for that).