Flick scrolling on many levels is a highly approvable gesture, for it bears all the immersiveness, casuality and coolness a distinguished tech bohemian as well his pubescent sister demand. However, the usability of flick scrolling is limited by the length of the list you want to scroll through. While several dozens of list entries can be efficiently handled with flick scrolling, several hundreds of entries eventually become a real drag. And such several hundreds of mails or short messages or photos today are the rule rather than the exception, particulary with social networking so tightly integrated into Windows Phone.
The limitations of flick scrolling led Google to implement scrollbar-like grips when scrolling through long lists in Android so that you can move from A to Z in no time. Windows Phone 7 also provides visual feedback when flick scrolling through a list or web page by displaying an ethereal scrollbar that signals your position. However, this scrollbar only serves as a visual indicator, not as a means of user interaction. I would opt for slightly larger but touchable scrollbars which would allow you to navigate lists of arbitrary length most efficiently.
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