I'd heard that 10.1 will include support for GPX to points. This should also include the option to import as polyline, according to the time stamp (as it does in ArcGIS Explorer). In addition, the tool/feature should be two way: we should be able to take a point or line shape file and convert to GPX to upload onto a GPS. I work in and teach saerch and rescue and this would be a great feature to have, allowing us to upload critical parts of our SAR maps (landing zones, clue locations, safe routes) onto team's gps units. I suspect it would also have wider public use for cyclists and other recreation.