servo, with the Custom Functions as per the Sports Illustrated standard configuration - http://www.siphoto.com/
sometimes the low speed and sometimes high - the large buffer really helps. IS is more of a battery drain than servo. Last day of the race I shot roughly 1200 frames on one battery - actually surprised myself.
I like the mountains - grew up in Calgary. Any shots of you local areas?
Here's a link to the race shots - you can tell from the exif what I was using - 420mm = 300 + 1.4 and 600 the 2x. Shots aren't nearly as sharp was with a remote and mlu with 2 sec delay http://www.timgrayphotography.com/gallerie...prix/index.html
Motion blur thanks to PS.