I thought I had a fairly good idea how this was supposed to work. Nope, just blew a bunch of time and effort covering a Road Bicycling Race by not setting up correctly. I think my mistake was shooting in program mode. It locked my shutter at 1/250 which is max sync for my D-200. I then dialed back the output on the flash an SB-600 to -0.3 (1/4). I got beautifully sharp foreground, nice bokehed background and non sharp subject. It appears obvious to me that I need to be shooting at more like 1/500 or faster since the sync speed is only 1/250 and the flash wasn't stopping the motion... When I shoot normally with out trying to fill I can make nice images. Today was badly back lit, and very high contrast, so I knew to get faces I needed to shoot fill. Now I need to figure out how to do it right....
I was shooting right on my subjects, +- 10 feet (media creds are the bomb..) using a D-200 Shutter priority, iso 200-400.16-85 zoom at 16 mm. I'm guessing I need to be shooting full manual, with the flash in manual, dialed back to the desire power...
The good stuff is here 2008 Tour Of Utah