Ok, thought I'd stick this one up here for people to consider. I have just returned from Florida and I took this on an airboat trip (vibrated like crazy and noisy as anything!) with a Canon 20D and 100-400mm IS L lens at roughly 200mm, 1/2000 sec at f 8.
Go ahead, say what you think.... I'm a big boy now <g>
Cheers,
Rob