List of common resolution for screens ;)

320 x 480 is a very common resolution for mobile phones. Here is a big list of a lot of phones and their resolutions. Maybe it'll help give you an idea of what's out there. For desktops Full Screen: 800 x 600 1024 x 768 1280 x 960 1280 x 1024 1600 x 1200 Widescreen: 1280 x 720 1280 x 800 1440 x 900 1680 x 1050 1920 x 1080 1920 x 1200 1024 x 768, 1280 x 1024, 1920 x 1080 are pretty common to the best of my knowledge. But obviously the more resolutions you support, the more compatible your wallpaper becomes -- the drawback is that it requires more work for you.