Verified answer

If all your files were purchased from iTunes store, use "Transfer Purchases" option to transfer. See http://support.apple.com/kb/HT1329

If some of your songs were from other sources, you will need to utilize some iPhone transfer program to help you, like this handy program called Tansee iPhone Transfer

http://www.gutensoft.com/Utilities/Tansee-iPhone-T...

Many of my friends are using it for its easy and safe transfer. The whole process goes as follows:

Firstly install this program on your computer. When you connect your iPhone to the computer, this program would instantly display all music and videos on your iPhone. All you need is to select what you wish to transfer and click "Copy" button. Done. All your selected files will be copied to your selceted folder on the computer safely. Now you can easily add those files to the iTunes library.

More importantly, this won't overwrite any original files on your iPhone.

Here is step-by-step guide on the whole process:

http://www.gutensoft.com/Guide/How-to-transfer-son...

Hope this can help.

You can also search more others at http://google.com/

You can use an iphone to computer transfer program to help.I personally use Cucusoft iPad/iPhone/iPod to Computer Transfer.It helps me to transfer my songs/videos/photos/playlists etc from iphone to my new computer iTunes directly and safely.It works well for me,you can give it a try.

Free download it at: http://www.ipodtocomputercopy.com/ipodconverter/ip...

It even has step-by-step guide on the whole process.

Hope it helps.

You can keep asking on http://answers.yahoo.com/ or use http://www.ask.com/ to search more

Full guide: Transfer songs, videos, photos and playlists from iPhone to Computer

http://www.transfer-iphone.com/transfer-songs-vide...

GOOD LUCK!

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