How do I sync one iPhone with two laptops using iTunes (not iCloud)?

I just got a new iPhone 4S and want to sync it with two separate laptops (using the simple cable procedure, not iCloud) -- my old(er) MacBook Pro2.2 15", with Intel Core 2 Duo running System 10.5.8, and my new MacBook Pro with Intel Core i7 running Lion.
I tried this once before and got chaos -- syncing on the second laptop gave me multiple entries in my calendar and address book. I don't want to go through this again until I know the right procedure, if there is one.

When you get your new laptop repaired, transfer your iTunes library & other important data to your new computer. When you first sync your phone to this computer, all iTunes content will be erased from your phone. However since you've copied your iTunes library to your new computer, just sync the content back to your phone.

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    chateaudrive wrote:
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