SystemUIServer:

      Version: 1.5.5
      Last Modified: 8/23/09 8:22 PM
      Kind: Universal
      Get Info String: SystemUIServer version 1.5.5, Copyright 2000-2009 Apple Computer, Inc.
      Location: /System/Library/CoreServices/SystemUIServer.app

    UserNotificationCenter:

      Version: 3.0.0
      Last Modified: 1/29/07 11:03 PM
      Kind: Universal
      Location: /System/Library/CoreServices/UserNotificationCenter.app