Works with windows 7!
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http://techie-buzz.com/tips-and-tricks/quickly-change-windows-vista-desktop-icon-size.html
The icon size in Windows Vista is quite large by default and it is quite
a pain to go to personalize
and then change the icon size.
Here is a quick tip for those you use Windows Vista and have a mouse
with a scrolling wheel.
To change the icon size of the desktop icons, click the Ctrl key while
you are viewing the desktop
and scroll your wheel upwards or downwards to change the icon size to
your satisfaction. That’s it,
its as easy as a click and a scroll.