I have 3 Mac notebooks I use quite often interchangeably. On the road, I take a 12" PB while at home I use 15" & 17" MBPs. I just bought the iPod Touch 32GB and synched up with my 12" PB. If I just want to sync with other Macs for certain data only (say, the address book, contact lists, and etc), all I need to do is to opt out of the automatic synch? Is that all there is? I want to avoid overwriting my iPod Touch each time I synch up with other Macs.