I was wondering if there is a method to transfer everything (music, movies, ringtones, settings, contacts, books, pictures, everything) onto another computer? I know "transfer purchases" will transfer apps and stuff, but I want to transfer everything, so that will not work, not to mention most of the music and movies are not from iTunes. Basically I just want to know where are all the stuff stored on my computer? I know that apps are stored under my music\iTunes\iTunes media\mobile applications or something like that, what about everything else? Thanks.
Copy the whole Music/iTunes folder and it's fine. I tried it this summer. Of course if you have music elsewhere, you have to copy that too, but using iTunes/File/Library/Organize option takes care of that.
firstly you can take a look at http://support.apple.com/kb/HT4527 and http://support.apple.com/kb/HT1727 if you want to do it in a faster way, you can use iPhone music transfer. with it, you can Transfer iTunes Music to Another computer effectively.