Easiest way is

put the device in DFU

open a terminal and type in the following :
while sleep 1; do cp -R /tmp/PersonalizedRestoreBundle.* ~/Desktop/; done


then do the otion-key restore

as soon as you see the directory appear on your desktop do a ctrl-c in the terminal.
both files are copied now

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iPhone 3GS 16GB
iPhone 3G 8GB 3.0 JB
MacBook Pro 4GB, 250HDD running Leopard 10.5.7
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