For those of us lucky enough to have a second monitor, either at work or at home, the wallpaper you choose for your desktop is letterboxed on your second monitor by default in Windows. PaperTwo allows you to install a second wallpaper that fits your second monitor properly, allowing you to enjoy a slightly better view!
PaperTwo will crop, stretch and / or squash the image as necessary to Create the best fit for your second monitor. Be sure to choose an image size that is roughly the same proportions to avoid ugly pixellation.
Note that PaperTwo is designed to support .bmp, .gif and .jpg files only. At this time it does not support .png or .tiff files.
Note also that if you only have one monitor, PaperTwo will replace your main wallpaper instead (intentionally, although it's of little benefit).