My wife got a new iPhone 3GS to replace her old 1st gen iPhone. I synced the new phone to iTunes on her Windows computer and chose the option to replace the old iPhone with this new one. Her existing contacts, pictures, etc. all transferred over to the new phone. After doing this, I realized that she hadn't synced her old iPhone for quite a while and there are several newer pictures, contacts, calendar entries, etc. that are still on the old iPhone but not on the computer or on the new iPhone. Now that I've already switched her iTunes setup over to sync to the new iPhone, what's the best way to get the missing data from the old iPhone onto the new one?