Apple - Can I extract application data from an iOS device?

There is no need to jailbreak.

An application like JuicePhone will do the trick, if you have a MacOS X computer. Just make sure you turn off encryption for the backup.

There is a tool called iPhone Backup Extractor. It lets you extract app data from an iOS backup, which you create with iTunes. I posted a detailed tutorial on how to use it on my blog: http://adriansieber.com/how-to-extract-data-from-ios-apps-on-mac-os/

I use PhoneView to access (read and write) that data directly on the iPhone. It does not require you to jailbreak, but if you do, you can have more access. It doesn't care if your backups are encrypted as it just asks you for the password before reading the files on the iPhone. I am a very happy customer and have gotten support from eCamm even when I am running beta Mac OS versions with beta versions of Xcode and beta versions of iOS. It is rock solid on the shipping versions of the software and won't hold you back if you like to live on the edge or develop for iOS.