There are bug reports in Google's bug tracker for the issues (I filed a couple, and there are a couple more submitted by others). I'm hoping that the good people at Google will fix them, or persuade Apple to fix their bugs.
- After panning the map, new points for the area are not correctly loaded, because the maps API doesn't give the correct corner coordinates for the currently visible area.
- You can't tap on an item, because click events do not fire on markers.
- You can't zoom or switch map type, since the standard Map controls (GSmallMapControl, GHierarchicalMapTypeControl) cannot be clicked on an iPhone.
Update: I have obtained an iPod Touch for debugging, and enhanced iPhone support for APRS!