I too am looking very much forward to July 11 when the new phones come out. I doubt the iPhone GPS will replace my GPSr, but as a backup and additional tool, I think it will be great. Now, what to do with my "old" iPhone?
FYI - There is a nice writeup of the Marin CA program in Scouting Magazine's current issue. http://www.scoutingmagazine.org/issues/0805/a-tracking.html
I am excited to try some of these things in our council.
-Ric