I tried different shutter speeds, in the end settling between 1/80 and 1/30. We drove up and down a section of road so that we got the sun exactly right, and I kept snapping away. I simply strapped the camera strap around my arm and then leant out of the car clicking.
80-200mm f/2.8 is my next big purchase as well. I fell in love with 180mm f/2.8 but it wasn't that usable and at the time I needed money for something else so I ended up selling it. Should have kept it, damn it was sharp.
Would be awesome if I managed to get an 80-200 during this year, but it'll probably have to wait 'till 2008. Well, at least if I try for the 2-ring version. Might end up with a pump version if a nicely kept lens comes my way.