thanks farmer.
david: you cant go wrong with the 400 mm.i almost never use a monopod,or tripod,unless i,m going to be doing static shots under tough lighting.i,ve got the brace that moira mentioned,and i do reasonably well with it.my thing is flight shots,so when i go out i,m in that frame of mind,and always ready for a bird flying by.i pre-meter,and adjust camera settings in manual for the present lighting conditions,so i,m not fumbling with settings if something flies by.one of my friends( nikon shooter) just switched over to 40-d/400mm,because nikon doesn,t have an affordable lens of that focal lenght.nothing wrong with either brand it,s just that canon has a more broader range of birding lenses at our disposal that will fit almost everyone,s budget.
by the way the canon 400 f/5.6 is still the fastest, and lightest lens of this caliber for doing flight shots.