Can Google Earth App for the iPad specify a KML using a URL without having to go through with one's Google My Maps Account?
Yes with the deprecation of the Maps DATA API http://googlegeodevelopers.blogspot.com/2010/11/maps-data-api-deprecation-announcement.html
you can now use v3 Google Maps API with Fusion Tables
(this becomes the default and will be official on 1st Feb 2011)
I'm having similar problems using Google Earth on the iPad. I was able to convert CSV files through FUSION, then onto Google Earth Pro, then save as KML and into My Maps, then access it via Google Earth on iPad. That worked for about a week, then my files disappeared. Has this ever happened to anyone, or do you know how to fix it?