In short, no.
Only the 580, ST-E2, 7D, 60D, 600D can do that. I never realised it until I tried using it, but the signal to send to slave-flashes is actually a flash itself. So the 5D-line probably never will, because it doesn't have a built-in flash.
So you're stuck using the 580 on-camera, unless you get an ST-E2 or 3rd-party trigger-system...