Thanks for the comments guys.
I agree with the color v. b/w. I was trying (in the b/w) for that high key effect that Sergio could do so well - I didn't really come close, but I may have another go at it :)
Bob
Bob, great idea. captures the motion nicely. Just as a photograph, I prefer the BW, but I think the color gives the best sense of speed. Very nice work.
Richard