Answering this question: How do I import/export KML to ArcGIS Desktop? raised another one. There are loads of tools to import/export kml/kmz. Are there tools available for native viewing of KML in ArcMap?
I'm curious if anyone has built a custom featurelayer(s) that reads kml, similar to the way ZigGIS uses PostGIS as a data source.
Or maybe something like inmemoryworkspacefactory, which probably doesn't count as native, but would have some advantages: http://geobabble.wordpress.com/2007/07/10/consuming-georss-in-arcmap-with-inmemoryworkspacefactory/