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I've bought a new computer because I can't hold up my work while I wait for my older MacBook Pro to return from Apple's repair shop. In the meantime, I've not backed up my iPhone 3G for a week. I plan to sync my iPhone to the new MBP. There's a good discussion of migrating an iPhone to another in a different question -- but it's built on the idea that the old computer is around and involved.
So -- what will I lose or what side effects will I suffer if I just plug my iPhone into my new computer and sync to iTunes?
jtimberman is correct. Just because you connect an iPhone to a new computer, doesn't mean you have to sync it. You will get a warning before syncing because that will erase the data on the phone, but syncing isn't mandatory. I connect mine to my laptops at work and at home all the time to charge it without issues.
However, I don't think non-MobileMe accounts have any bearing or are affected by iPhone syncing. – Philip Regan – 2009-08-25T10:33:04.903