Oops, i forgot the explanation about distributed.net...  Sorry :-)

Founded in 1997, our project has grown to encompass thousands of users around the world. distributed.net's computing power has grown to become equivalent to that of more than 160000 PII 266Mhz computers working 24 hours a day, 7 days a week, 365 days a year! Our infrastructure has been enhanced over the years and refined to a point where it can reliably handle tens of thousands of new computers. Join us in this ground-breaking computing experience. We need your help... 
 It's very simple to participate in our challenges. You only need to download a small program, which will talk to our network and begin to process parts of the current challenges. The program uses only the computer's idle time, so when you want to use your computer, the client will automatically get out of your way. Plus, there's that cute little cow icon... 

Wangee