Multiple windows from multiple applications on a typical multitasker's desktop can easily get out of hand. Window's Explorer has a tak bar suited for a few applications, but even reduced to icons they can still become too many to handle.
The thumbnail swingbar creates a small button for each window, and swings thumbnails into view as you hover over them, allowng you to select from every open window with just a short movement of the mouse.
It is more fun than really useful, but neat enough to share.