I assume the reason this wasn’t implemented at any time is because it would enable you to transfer commercial content from your iPhone to an unlimited number of computers ~ which could very well be exploited for piracy.Since you lost your previous Library your only option seems to be using a third party software to transfer all content (music, videos, photos) from your iPhone to the new computer.example for Windows:http://www.copytrans.net/http://www.macroplant.com/podtopc/example for Machttp://www.macroplant.com/podtomac/As for your Apps there was an update to the iTunes Store which allows you to view and re-download all previous purchases and downloads.All you have to do is to open the iTune Store, login with your iTunes Account. On the right hand side you will find a link called “Purchases” which will give you a list of the previously bought and downloaded apps.