It's only worth it if you:
1. Already have 2 8800GTXs
2. Already have a 1000watt PSU to power 3 GPUs
3. Can get a 8800GTX for $100 or less
Ahh good point. That is true.....well put. May I ask are you also an NVIDIA fan as I am? Anyway, I agree. It is only worth it if you already have the capable power supply and what not and I also agree with the price issue.