Korean iNavi G1 combines GPS with Karaoke
As NaviGadget point out, this will almost certainly never be launched outside of the Korean market, but that doesn't mean we can't marvel at its converged craziness.
Like most Korean satnavs, this boasts a DMB TV receiver, and yes, Koreans do watch TV shows when they're driving around, and yes, it is dangerous.
It also has the rather nifty feature of rendering 3D maps including details such as the stars in the night sky and mountains in the background.
There is a "Car Diary" software app that lets you keep track of car-related expenses, but the real USP is that kerazy Karaoke capability.