Music files downloaded from the iTunes store come in the format "Purchased AAC", and video files downloaded from the iTunes store come in the MP4 format
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No, you will not be charged.
The EVO 3D has 2 flashes, it is definitely the best
Its possible but its illegal if you don't buy it from the iTunes store.
The Facebook iPod Touch/iPhone app can be downloaded from the iTunes App Store.
Practically anything, for example: photos, downloaded games, files, etc.
Ifrogz can be downloaded using an Iphone or Ipod and entering the "app store." One can also acquire this app by going directly to Itunes' website and downloading it there.
Snapfish is the website that allows you to create and share photographs and photo products. Fortunately for iPhone owners, Snapfish does have an iPhone app and it is compatible with the iOS4. This application can be downloaded from the Apple app store.
Your songs on iTunes are sound files. If you downloaded them from the iTunes store, they are .m4a files. If you downloaded them from elsewhere, they may be in a different format, but they are still sound files. To locate the files on your hard drive, simply right click on a song on iTunes and click "Show in Windows Explorer" (at least on Windows).
iPhone apps are programs which allow iPhone to do more. They are often games but they can also add functions to iPhone like speech to text, voice control, gestures control, tuning musical instruments, drawing, editing photos etc. They can be downloaded from Apple App Store, which is on the iPhone.
To make an App for the iTunes App Store you will need the iPhone's Software Developers Kit which can be downloaded from Apple's developers site.