Quick Help Needed--What do Do Before Heading to Store to go from 3GS to 4?

[Pseudo-Fed]

Taking my stepson to AT&T store to upgrade from 3GS to 4. Just a sync/backup beforehand? What else to ensure all apps, music, etc. transfer?

 

[iGaz]

Just sync your phone before you go. When you come home with your new one choose restore from back up of XXX's phone...