OperaTor is a portable software bundle which allows you to browse the web anonymously. It combines the power of the Opera Browser, Tor and Privoxy.

With OperaTor no data will be stored at the computer you plugged your portable memory into.
Changes in the current release

    * fixed an issue where executing more than one instance of OperaTor would cause Tor and Polipo to remain running after closing OperaTor
    * solved an issue where downloading a file to disk could cause OperaTor to save Opera\'s profile folder to the same location
    * OperaTor now checks if there are no existing instances of \"Tor\" or \"Polipo\" running
    * as there were no complaints about \"Polipo\", the \"Privoxy\" version of OperaTor has been disco

 
http://archetwist.com/en/opera/operator