I have an Android based phone called an EVO. I use the GPS function heavily when I travel. A huge complaint amongst Android owners is that the default maps program does not do a good job caching maps for the traveler who doesn't always have network access. It would be fantastic to be able to pre-download the maps of interest ahead of time, and then navigation with those already in the phone. Of particular interest for the international traveler. There are 3rd party GPS/Navigation apps to do this, but non have integrated in with the existing Maps program, and all disappoint. An App that integrated into the Android systems Maps program that did this would be huge.