Smooth Windows

Smooth Windows is an extension (native on PowerMacs) that replaces the standard window moving code with a far cooler implementation. First off, it makes it possible to drag the actual window without erasing either the window contents or the desktop background. Smooth Windows also includes features to constrain window movement to horizontal/vertical axes, and a special precision movement mode where all moves are scaled down when you need that one-pixel adjustment.

However, the real beauty of Smooth Windows lies in its translucency effect. Provided you have the memory and the processor speed, Smooth Windows will draw windows translucent so you can see through while moving them around. This feature can be disabled automatically based on window size or screen depth to avoid sluggish performance.