I haven't read a lot of Martin - although I think `Sandkings' is one of the best stories ever written. And I haven't read a lot of Gaiman either - although I loved American Gods with a passion. Thanks for the link; I'll sit and give that a read when I get time.
`Auto da Fe' was written for the original Dangerous Visions anthology, I think, which is where I read it first. `Last Of The Wild Ones' is another one I don't know, but now I think about it, Zelazny did seem to have a thing about cars.