I ask this question because I recently had a "software glitch" and replaced a week 32 iPhone with a brand new week 47 iPhone. The Genius asked me "when was the last time you synched?" It was easy for me to answer, "just a few hours ago!" Apparently, the recent sync made the transfer of my contacts, email addresses, iCal, music & videos, etc. much easier and in about 5 minutes I had everything my week 32 iPhone had, minus the "software glitch."