I have a Taurus X with the Nav and Sync, and I have a couple of issues that I would like to see fixed. 
  
Bugs: 
  
About 1 in 10 times when I start the car, the "User Device" which I alway want on my iPod, will randomly switch to my BT phone which doesn't even have music on it.  I then have press the source button to get it back to where I want it.  It seems to be a race condition as to which device Sync finds first.  My iPod is dedicated to the car and is rarely removed unless I want to update the songs on it. 
  
When connecting to the phone at startup, a little popup dialog appears which says something like "connecting to phone".  Sometimes that dialog will not go away unless you switch to a different screen (Nav, phone, menu etc.) 
  
  
Enhancements: 
  
I would like to know which playlist is currently playing. 
  
There is a status bar at the top when I am viewing the navigation system etc.  It would be nice if it showed current track and artist. 
  
When I ask for a single track, I would like it to return to the previous playlist when done. 
  
Show me album art and lyrics.  
  
Allow me to alias the user device so I could call it iPod or Zune instead.  User device is just awkward. 
  
Allow me to string together commands.  "Phone call home" instead of "Phone" <wait> <bing> "Call Home" 
  
Over all it is a very good system, but it does have a some rough edges.