illuminate the subject! think spotlight on a stage
Hm, this seems to make sense. Buy bigger flash heads! (And use them: I had an 550EX in the bag.) I think the reflections might have been nasty unless I could organise a very long flash lead and kept the flash to the far left (or to the right? on top of that computer monitor?).
One image where it would almost certainly have worked well is this one (I wonder if I can fix it digitally!?):
Thanks, Ed! I'll try it out.