The prior poster wrote:
One big drawback I see is that since it works using cell towers to "ping" your location, if you were in an area with weak or no cell coverage it ain't gonna work. A GPS device would'nt have that problem at all.
My response is:
With both Microsoft and Google Maps, the map cache on your PDA is minimal meaning that if you don't have a cell tower to triangulate from, you probable don't have data on the phone either.