This is a neat little tip that a coworker of mine discovered this morning, and it's going to really come in handy on my new laptop. If you don't like the size of the desktop icons in Windows 7, you can easily make them larger or smaller. Simply hover over an icon, click ctrl, and with your mouse wheel scroll up or down. The icon sizes will change as you scroll.
Don't have a wheel mouse? There are other methods for doing this as well, as shown here: http://www.addictivetips.com/windows-tips/how-to-resize-desktop-icon-in-windows-vista/