G1 here.
For Route tracking, MyTracks is the one I keep coming back to, have also tried CardioTrainer which is pretty good – but probably better suited to running, there's also a new app called Maverick – which I think you can also use to follow waymarked routes and even use cached maps, but havent had chance to test it out yet.
As for the car navigation, I think co-pilot live is supposed to be the best, not tried it though. I've heard the google navigation won't be coming to the UK in the 2.0 release, or in the very near future, something to do with the licensing of the maps and the peeps over at Tom Tom, but we will be getting multi-touch in it's place.
Having said that though, there is apparently a hack that can be done to unlock the navigation feature, just google it 🙂