ArcGIS Editor for OpenStreetMap 1.1 Beta 1 is out :o)

http://esriosmeditor.codeplex.com/releases/view/57313

- Multi-part geometries are now supported. Homogeneous relations (consisting of only lines or only polygons) are converted into the appropriate multi-part geometry. Mixed relations and super relation are maintained and tracked in the stand-alone relation table

- The underlying editing logic has changed. As opposed to tracking the editing changes upon "Save edit" or "Stop edit" the changes are tracked as soon as the edit sketch is completed. This might take 1 or 2 seconds, please be patient.