I don't have 10.1 - does it work for ArcGIS 10.0?
On the developer's website, the software is listed as being compatible with the ArcGIS 10.X. The "X" means that Arc2Google is compatible with the versions of ArcGIS 10 and its derivatives.
The developer also released an update for this software and you can download it through the official website: http://www.husseinnasser.com/2011/01/arc2google-for-arcgis-10.html
Note: Click the link on the bottom of the post to reach the download page.