Just to further underline the importance of this project and the progress it's helped provide to particularly cancer research:
A colleague of mine was diagnosed with lung cancer 3 years ago. At the time of the diagnose, it was terminal. She was told that people with the diagnose usually had less than 2 years left to live.
But research and development of new types of medicine has improved at such blazing speed, that they this year changed the diagnose from being terminal to instead being permanent. This means that they now have a firm belief that with the right (new!) medicine, she'll be able to lead a somewhat normal life, though there still is no cure. But the fact that it's no longer a terminal diagnose, just proves the importance of the research being done in particularly the cancer field these years.
I can't highly enough stress how insanely important I find the WCG project and if it was up to me, all hardware vendors should deliver computers with pre-installed WCG clients. The impact on humanity in general would be remarkable!