Equipment Preview

:See also: ItemPreview 2
In almost all places, if you hold down Ctrl and Right-Click on an item's name or icon, it will summon the Equipment Preview window to show you how the item or mob appears in game. This does not apply to Accessories, and not all mobs will preview.
Left-mouse-drag will rotate the image without moving it's center.
Right-mouse-drag will move the image without turning it.
Mouse-Scroll-Wheel will move your point-of-view in or out (Zoom: make the image smaller or larger).