Gdzhlpr: I can only answer your first question, so I hope that's all right. With an app called Multipicture Live Wallpaper you can have different wallpapers for each screen, assuming your Nook is rooted and you're using a launcher like ADW, LauncherPro, or Zeam. I don't think you can have different wallpapers for a Nook that hasn't been rooted.
