I don't know if any of you have tried the Better Beamer flash attachment, but I tried it for the first time today and am very pleased with the results.
My backyard faces East and is shaded by my house and a couple of 40-50 foot trees in the afternoon. Taking pictures in the afternoon has always been difficult because of the poor lighting available at that time.
This was shot with a Canon 30D, Canon 100-400mm lens, Sigma 1.4X teleconverter, Canon 580EX Speedlight + the Better Beamer. Even though I was 35-40 feet away, you can see the shadow of the hummer on the fence that was created by the flash+the Better Beamer.
This was shot at f/5.6 - 400mm (resulting in f/8 - 560mm because of the teleconverter) at 1/1000s ISO 200.