Just in time for the ESRIUC, Esri has announced their OSM editor for ArcGIS. The add-on allows ArcGIS users to download data from OpenStreetMap, store it locally in a geodatabase, and use the advanced editing environment of ArcGIS Desktop 10 to create, modify, or delete data. Once the edits are complete, the changes can be posted back to OpenStreetMap and made available to the OpenStreetMap community.
To download ArcGIS Editor for OpenStreetMap or to provide feedback about the tool, visit the project’s Web site at www.esri.com/osm-editor. See more details in the official announcement