A pre-installed VNC client pre-configured to allow reverse connections would allow users to easily / remotely display an OSX desktop via the ATV (i.e. it would essentially mirror the display on a MBP or MacPro onto the ATV). I frequently have the need to walk someone through a presentation or do a quick software demonstration, and would love to be able to use the projector to which my ATV is connected w/o having to cable-swap.
I plan on doing this manually using one or more of VineServer, JollyFastVNC and/or Gitso; however, including this on your patchstick would provide a very useful feature for numerous other ATV users.