The latest version of Revindex Impersonator v1.1 introduced a new feature to allow you to impersonate a user and restore back to yourself easily with the click of a button. For example, you may use the Impersonator to place an order on your site on behalf of a customer on the phone and you need to quickly switch back to the admin user.

http://www.revindex.com/P...r-1-0-4/Default.aspx