I used to have a thing on my computer called SETI@home, i know there were a few things out there like it, such as Folding@home, but i was just wondering if there were any other things out here like these ones that utilise your comptuers idle time for something half worthwhile?

SETI@home
Folding@Home
Einstein@Home
LHC@home
uFluids@home
Predictor@Home
Rosetta@Home
Sztaki@home

There's also something to use your idle time to find a Mersenne prime number. Hardly useful, but fun. See http://www.mersenne.org/.

Is Folding@Home the same as the Google-provided protein-folding grid computing app?

Yes. With Folding@Home you download a program that runs calculations to simulate protein folding. The Google toolbar comes with a Google Compute component, which runs the same calculations.

Edit: I might need to clarify it's not really the same program. When you download the Folding@Home program, you are always devoting your idle time to that project. Google Compute simply works on the code its being given; now that's Folding@Home, but in the future this may change.

SETI@HOME stopped working with the original client.

All the @home programs I believe went to BOINC

http://boinc.berkeley.edu/

I'm running three BOINC projects

Rosetta
Climate Prediction
Predictor