Iphone to Android Switch

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http://androidforums.com – I'm going switch from my iphone 3gs to a samsung galaxy siii soon, and I was wondering what some of the important differences in using the os in general are. I using my phone as my mp3 player, and right now itunes manages my music, apps and ebooks. I already have songbird on my pc, but now I realize that it does not manage apps and ebooks. How does one manage these basic tasks on android? I have never had an android phone, so I am wondering how to transfer music and video? Is it just like a usb drive? What other quirks are there from iphone to android? (General)