The ArcGIS Online assistant just saved me hours of work. Thanks a lot for the tip, Mike!
All,
On January 12th, we are releasing "Admin Tools for ArcGIS Online" on the Marketplace that will take care of this and many more administrative functions that you're probably looking for. This product grew from an internal toolbox that we use on a regular basis inside of GEO-Jobe to administer the organization accounts of our clients. We had the need to register lots of feature services, tag multiple items at once, change the ownership of several groups at one time, among other tasks that just aren’t that easy to pull off using the out of the box interface. Read more about it here for now www.mapthis.net . Check it out on Jan 12th and please give us feedback. We'll have a direct link in the bottom of the app where you can submit functionality enhancements.
All,
these tools are available now and have been for the last 10 months. Sorry I have not reposted since. Here is a link to the application - Admin Tools for ArcGIS Online & Portal