http://store.mp3car.com/Mp3Car_Infill_G4_powered_by_StreetDeck_p/sdk-014.htm

Looks like the G4 unit is finally going to be shipping here in the next week or two, and I'm seriously considering it for the Mustang. While I still love my empeg, this solution just pulls at me for allowing so much more in the way of navigation options as well. One thing I might consider is slaving the empeg into the system somehow, via the ideas here. I've backed away from the Mac Mini idea in the car for numerous reasons (lack of car friendly software on OS X, the amount of work to mount a mini over a DIN designed PC), but like the concept of the empeg in the mix still. For me, the use would be that the audio out on the G4 kinda sucks, and using the empeg for the music in a trunk mounted form would still let me have something easily removable to take inside to add more music.