Some impressive stuff as of recently:

IBM has backed a project, called World Community Grid, which aims to put the untapped processing power of
millions of unused computers into use; crunching numbers for scientists working to understand diseases like
HIV, Alzheimer's and cancer, to improve forecasting of natural disasters and to support environmental studies.
See what google news finds on the subject
Let your computer do something usefull for the humanity when idle- JOIN NOW !

Conspiracy against healt or Stuped Medicine ? (in bulgarian)