I keep hearing this advice again and again. Last week I picked up an optical slave. So now I can use 2 off-camera flashes to experiment. The question is: Do you have any particular assignments/challenges for this kind of lighting? Here's what I got from a session with my bro which was cut short: http://andrew4137.fotopic.net/c781047_1.html If you have any "double flash assignments", please tell me.