ChBg is for changing desktop backgrounds in a given period. It can render images with 10 modes (such as tiled, centered, scaled, etc.). It uses Imlib1, Imlib2, or gdk_pixbuf for loading images, so it supports many image formats. ChBg has a windowed setup program, is able to load setup files, can be used as slideshow picture previewer in its own window or as a desktop background, and can be used as screensaver or as an xscreensaver hack. It has a dialog for fast previewing of pictures and very usable thumbnail previews.
gRio500 is a Gnome/GTK program that lets you interface with the Rio500 MP3 player by Diamond/S3/SonicBlue. You can currently create/delete folders, add/delete songs, format memory, rename folders/songs, automatically downmix/resample MP3s during transfer, and preview MP3s (play/stop controls). You can interface with both internal and external memory (Smartmedia).
kmamu is a shell script which installs X icons for xmame into a folder on your KDE1 or KDE2/3 desktop. (These icons can be downloaded from the homepage.) When installed, each icon has a long description name as provided by xmame -listgames, and when clicked it will launch xmame with the appropriate game. Although the install script is specific for KDE, the icons are stored in X pixmap format and can be used with any window manager.