I want to point out the Video Encoding comparison is quite inaccurate. First they never stated which encoder they use, second x264 is much faster then the results shown, not to mention the quality difference between different settings or encoders.
The true difference will be shown once the x264 CUDA version is out. Although it is still many months away.
I have no doubt GPU are extremely powerful, and doing encoding on GPU means you could finally record you TV shows while still do something useful with your computer without the lag from intensive CPU usage.