If you are in a folder and would like to quickly resize the icons, there’s a shortcut you can use with your mouse wheel to resize the icons. This is a great way to show off the beauty of the new vector icons in Vista to your friends.
Just hold down the Ctrl key, and scroll the mouse wheel in any folder. The icons will immediately resize bigger or smaller.
Check out the new Windows Media Player icon scaled really huge:
The same thing works wherever you are in Windows. You can cycle between the different views this way.