I think that Google maps is about the only real player in the market. It comes free on the Droid, and I think it does on the Apple. MapQuest use to be the standard, but was so inacurate. It is now the AOL of computer aided navigation, IMHO. I have a GPS, but have not touched it in over a year since I got my Droid. And the best part is that it is free. Google works hard to update their maps, and you can report issues. If I know the area, then the suggested route may not always be the best, but it has always gotten me from A to B, 100% of the time. I have not tried Bing maps, but I don't have to because Google Maps does everything that I need and more.