this is not my application but it looks quite nice and I haven't seen it in here yet. It is a wallpaper application that provides high quality wallpapers for my Android phone (aka T-Mobile G1). The app is so simple but yet powerful as I can find nearly everything in there and most of the images look really nice.
Just in case someone likes to check it out as well. Here is the link.
Website: Wallpaper Megaplex for Android Phones