I have noticed a number of queries about LINUX and MAC OS X. Right now the World Community Grid only runs on Windows. The FAQs say that a LINUX X86 version is being developed for 2005 and that more OS implementations may come later. I will point out that there is another non-profit public domain grid project running right now that can run on MAC OS X and on LINUX X86. It is Folding@Home at: http://folding.stanford.edu/

Quoting from the project description:
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What does Folding@Home do?

Folding@Home is a distributed computing project which studies protein folding, misfolding, aggregation, and related diseases. We use novel computational methods and large scale distributed computing, to simulate timescales thousands to millions of times longer than previously achieved. This has allowed us to simulate folding for the first time, and to now direct our approach to examine folding related disease.

What are proteins and why do they "fold"?

Proteins are biology's workhorses -- its "nanomachines." Before proteins can carry out their biochemical function, they remarkably assemble themselves, or "fold." The process of protein folding, while critical and fundamental to virtually all of biology, remains a mystery. Moreover, perhaps not surprisingly, when proteins do not fold correctly (i.e. "misfold"), there can be serious effects, including many well known diseases, such as Alzheimer's, Mad Cow (BSE), CJD, ALS, Huntington's, and Parkinson's disease.
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My understanding is that Folding@Home is a general research project attempting to learn how proteins fold, that is to say, the general rules that proteins follow, starting off with a lot of number-crunching using low level quantum chemistry conditions. In contrast, the Human Proteome Folding Project is attempting to determine just how human proteins are folded up so that this information can be used by molecular biologists for medical research. The goal of Folding@Home is to develop rules that would allow us to rapidly compute how any proteins are folded, including human proteins, helping molecular biologists in many research areas. The two projects are complementary, since results from the Human Proteome Folding Project are available to researchers using Folding@Home and might give them helpful hints. All this is my own understanding, and I may have it completely wrong.