System boots Puppy using a custom built kernel and custom boot image.  Once booted, it loads Fluxbox and runs MythTV with the customized menu and theme.
 

Left: System Boot/Custom Bootscreen

Right: System Booted/Main Menu

Main menu for Myth with customized theme.  Note the back arrow at the bottom of the screen.  This is the result of customization and adds the ability to navigate backward through menus.
 

Center: Main Menu of MythTV using customized menu and theme

MP3 Playback and visualization.  During song playback, it is possible to navigate to any song or playlist.  To me, this is a great UI for fast selection and playback.  Playlists are defined in a separate screen, and are stored in the mysql database.
 

Left: Main MP3 playback screen

Right: Visualization during MP3 playback

GPS and DVD playback.  The iGuidance screen is running under Crossover Office.  The Xine DVD playback is clean and clear, and the Dolby Digital sound is amazing.
 

Left: DVD Playback in Xine

Right: GPS Navigation in iGuidance