I wish we in the US got the empty bin on the dash, like we've seen in some non-nav cars. I've seen some awesome handheld GPS installs in the X3 dash bin that look better than the 2nd hump nav. Like this install:
This person routed the wires to the glove compartment and tapped into power from the flashlight charger. They also ran a wire to the auxiliary input on the stock head unit and is using the MP3 playback functionality on the Garmin StreetPilot.
Supposedly, the retrofit was not difficult at all, including making the leatherette covered receptacle to look stock.