SmallLuxGPU is a LuxRays (luxrender.net/wiki/index.php?title=LuxRays) demo and a LuxRender v0.8 "proof of concept" (luxrender.net/wiki/index.php?title=Luxrender_and_OpenCL).
Real-time sequences were recorded on a i7 860 + HD5870 + HD5850 at the resolution of 1920x1200.
SmallLuxGPU and LuxRays are released under GPL license and the sources are available here src.luxrender.net/luxrays/. Precompiled binaries are available on LuxRender forums (check the section dedicated to GPU acceleration: luxrender.net/forum/viewtopic.php?f=34&t=4277).
SLG Blender 2.5 Exporter can be downloaded from this forum thread: luxrender.net/forum/viewtopic.php?f=34&t=4296
More information about how to enable SLG Exporter Live mode can be found on this thread: luxrender.net/forum/viewtopic.php?f=34&t=4078
NOTE: it seems that the complete Audi R8 scene has been designed by sentinel_ (blenderartists.org/forum/showthread.php?t=187782) and only the tyres where designed by Andrew Price. I'm really sorry for the error.