I'm heading out again this morning and scope them out. I see your stuff and wonder how you get the detail? Last night I just grabbed the d80, flipped it on the little running man icon and had at it. This morning I'm trying the d70 (I'm a bit more used to it and it has the 70-300mm lens already on it) and maybe 400 iso (I usually have 200 iso) and a larger aperture/ faster shutter speed combo.
I'm not sure why I like these God-awful-ugly things- They are like total masters at soaring.