Cudart Downloads
As the number of blog entires for cudart is increasing finding the downloads is getting more tricky so here is a handy page with the most relevant links:
Flash movie with more colours and more objects (quite a big download)
Example execute file (this is the CUDA v1.1 one)
Example execute file (this is the CUDA v2.0 one) - also contains viewport bug fix
And finally the more recent screenshots of both varieties:
Circle of spheres
Lena Texture on "Cornell Box" in cudart