Canon 30D, 70-200 f/4L, tripod: yes, cable release: yes
ISO: 100, manual mode- aperture: f/11, shutter: 4 seconds

I was about a mile away from the action and shooting over a tree-lined ridge.  You can see the trees in the lower left corner of the photos.  All three exposures were taken with the same camera settings.  The biggest challenge was anticipating when to start the exposures to achieve the best ‘trails’.