Do you participate in distributed computing projects?

[Zwelgje]

After reading the article Student finds largest known prime number at cnn.com I decided to download the GIMPS software to also participate in the hunt for the next prime number. In the past I also had the SETI@home client but I grew tired of it and deleted it.
This seems to be a more serious project so I decided to get into distributed computing again.

So anybody of you (used to) participate in similar projects as well? And which ones?

 

[Mega Tsunami]

I have been running seti@home for about 4 years now and have processed over 2660 units with a total computer time of 25,700 hours (that’s 1070 days or very nearly 3 years)!

And I have still not found a single ET.

 

[SeleucusNicator]

I run Folding@home.