Just want to promote http://boinc.berkeley.edu/ and the project I'm helping = Rosetta@home There is a lot of other projects but I think that one is one of the better since it actually are trying to make a difference when it comes to diseases. and not like some others of the projects, that is just wasting the power of computers(In my opinion). You will not noticing any difference by having it activated, but it will be using the remaining power you are having of your computer for scientific researches.