ImageToMp3 is a free utility that copies your cd-covers or other images into your MP3 files. It is easy to use and very small. Load the image, choose the category, add your MP3s, and press "Start". The images will be shown by programs like "Music Match Jukebox" or "Winamp" (with plug-in). It does not destroy or delete the id3 tag of your MP3-files.