Calling it a frontend is probably a bit much

but yeah, it's 'working' as best it can on the laptop at the moment.
I currently have no hardware for the car, so I have to use it with the laptop sitting on the passenger seat and the headphone plugged into the stereo in the car. The Internet radio is proving tough. I have a mobile broadband stick on the laptop, but this seems to only work whenever it feels like it.
Moovida works exceptionally well for the music and is a joy to use. TangoGPS is actually nicer than I though it would be, even without routing. It makes me think about my route, but I still have a instant reference should I make a wrong turn.
Keeping everything as 'standard' as possible makes it very easy to just use whatever software I want, and I just switch between them as I would do on a normal desktop. I need an elegant solution to volume control, but I think the rest is pretty much there.
Next step will be to get an amp fitted, and the stereo removed from the car. I'll then fit a 7 inch touchscreen and feed that to the laptop whilst I wait for the next payday

Removing the stereo is not easy in my car (already attempted it). It's due a service soon, so I'm going to ask them to take it out then.
After that, it will be a proper computer under the drivers seat. Then we are cooking. If I can get the mobile Internet working properly, I may not bother with any FM or DAB radio at all.