When it absolutely has to be duplex...

I've used iPartition to create a little extra volume on my external HDD with a copy of Leopard on it, so when I want to print things properly (i.e. without using kludged wrong printer drivers in 10.6) I boot into leopard to print. So I've got my decent photo printing, and my duplex printing back, which saves paper, but it adds 5 minutes onto each print run to switch OS's. It's a bloody shame there aren't any virtualisation apps that can run different versions of OSX in them.
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If it's brokenless, don't suffix it...