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/
At 10, 10.1 and onwards KML is supported in ArcMap trough conversion to features (no native rendering of the KML). Possibly in the future there will be native support, but its not on the radar at this time.
– KHibma Apr 05 '11 at 17:55