Mark sez, "Charity Engine
has a new twist on volunteer computing: using surplus, wasted PC resources to raise money for major charities including Oxfam, Amnesty, MSF and CARE - and also for huge prize draws for everyone running it. Based on UC Berkeley's famous BOINC software, the Charity Engine grid is hired to science and industry as a super-cheap supercomputer, then the profits given to the charities and volunteers. It's already paid out over $30,000. The app only uses a tiny bit of electricity and generates far more for the good causes - and the prize draws - than it costs to run. Free to download, Charity Engine is available now for PC and Mac."