I recently saw a screenshot of someone's multiboxing window layout where they had their main window across the top half of their screen, and four clones in windows beneath, something like this:

Code:
+-------------------+
|                   |
+----+----+----+----+
|    |    |    |    |
+----+----+----+----+
The lower four windows were almost square in proportion, while the upper window was extremely wide compared to it's height.

The strange thing was, the graphics inside all five windows were completely undistorted. How is this achieved?

Whenever I've tried resizing a WoW window to any odd proportion, other than 4:3 (normal monitor) or 8:5 (widescreen monitor), the graphics have ended up horribly distorted, as in this screenshot.

Any pointers appreciated.