title: Have you successfully used a GPGPU?
body: <p>I am interested to know whether anyone has written an application that takes advantage of a <a href="http://en.wikipedia.org/wiki/GPGPU" rel="nofollow noreferrer">GPGPU</a> by using, for example, <a href="http://www.nvidia.com/object/cuda_get.html" rel="nofollow noreferrer">nVidia CUDA</a>.  If so, what issues did you find and what performance gains did you achieve compared with a standard CPU?</p>