Testing a few applications

Hello guys :D
I am doing a project about CUDA for my University, and I would like to test some applications programmed for CPUs and GPUs with CUDA to see the speed up achieved by CUDA.
I have been looking for such applications but I cannot find any implemented for both CPUs and GPUs.
Does anyone know where could I find some examples?

Thanks a lot for your attention ;)

The nvidia samples which come with the cudatoolkit have these examples. For my purposes the nbody problem was the one which made my point.

Hello, Thudor.

Take a look at some password recovery tools. They are using all available resources (CPU, GPU, etc.) of the computer to achieve the best performance.
For example: Passware Password Recovery, Accent Software, Elcomsoft (shareware); oclHashcat (freeware).