The Google integration really is useful. Grabbed a little App from the Market called My Tracks that records your travel and then allows you to send direct to Google My Maps.
View Larger Map
That's the taxi ride from where I'm working to where I'm staying. Wish I'd collected more of them, you get some interesting deviations catching taxis here.
Liking the G1 but it doesn't take much data and GPS use to run the thing flat within a day. This tends to happen when I'm in a taxi and we're both lost on the way home.