Since the iphone 3G came out, the #1 feature I've wanted is turn by turn gps apps like TomTom or Garmin or Telenav. Today they announced that the 3.0 SDK will make turn by turn possible by allowing access to core location. I thought 2.0 already had access to core location. I have half a dozen apps that know where I am. And there already is one turn by turn app out there (lame as it is.) What is new in 3.0 that would make turn by turn any easier? Its not like developers will be able to use the maps... as they said, the developers will need to supply their own maps. Maybe I just missed something major, but I'm confused.