///// How to:

First open the size that matches with your screensize resolution by clicking on the image.
OSX: Drag (or save) the image onto your desktop. Go to System Preferences & open the Desktop icon. Then find the image and select it.
OS9: Drag (or save) the image onto your desktop. Go to your Control Panel & select Appearance. Click 'Set Desktop' & choose your new desktop.
PC: Right click on the image and choose Set as Background/Set as Wallpaper.
iPhone: Copy the image onto your computer. Sync photos from the Photos tab in iTunes/iPhoto. For iPhone 3Gs you can also keep your finger on the image, choose save. Go to the photo's on your iphone, and set it as wallpaper.
PDA: Copy the image to your Pocket PC. Go to PDA's setting of Today screen. Then select the image.