So I'm wondering why if an iPhone is a mobile device with which we are always on the go and downloading apps from, why is it that an iTunes sync only sends data to the iPhone and not the other way around at least as an option? I remember the old Palm/Apple iSync days when you'd sync your devices and both the PDA and desktop computer would inherit data they didn't have. The sync was two-way. You could choose to sync one-way and also choose which would be the main device. Seems quite logical. Every time I download new apps from my iPhone and go home and sync to my MacBook, iTunes erases the apps and layout because iTunes is replacing the iPhone data with the iTunes data. Quite frustrating. It ends up getting quite messy because if I deselect iTunes sync options and then reselect iTunes sync options a few days later, iTunes ends up replacing everything. Am I overlooking an option somewhere? Simply not seeing some options?