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Thanks Brian. Seems like a risky proposition at best. Any thoughts on other more reliable ETTL solutions?
I sometimes use a 24-foot ETTL cable to connect my camera and one 580EX set to Master, and use it to trigger the Slave(s), but there are still issues with the Slaves seeing the Master's pulses in some cases. It works great under the right conditions, though.
The most reliable method is radio triggers, but if you want ETTL rather than Manual-only you're talking a pretty serious investment.
I was on the brink of buying a Phottix Odin transmitter and some receivers, but I cancelled the order when I heard that Canon was releasing the new Speedlite 600EX-RT that has built-in radio triggering, plus the new ST-E3-RT Controller.
Since my existing Speedlites won't work with the new ones in ETTL-Radio mode, moving up would be expensive, but I might do it in a year or two.