If you want to rapidly resize the icons, there is a shortcut can be used with your mouse wheel to resize the icons. This is a best way to show off the beauty of the new vector icons in Vista to your friends.

Simply suppress the Ctrl key, and scroll the mouse wheel in any folder. The icons will directly resize bigger or smaller.

Check out the new Windows Media Player icon sized really huge:

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The similar thing works anywhere in Windows. You can series between the various views this way.

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