creating slideshow on PC from itunes album art

rather than seeing images of 3D Pipes, it would be nice instead to have a slide show/screen saver of the album art associated with the music in my itunes music library. it seems that itunes does not save the artwork in a format that Windows XP recognizes as a picture, however, so i can't figure out how to make this happen.

is there a way to find and convert the album art to a jpeg or gif? is there an itunes plugin that can make this happen? thanks for any help.