The Automator actions that control iTunes need iTunes to be version 4.6 or higher. "10.0" is alphabetically less than "4.6", and Automator hides these actions from the user. This is similar to the same of foresight that caused the Y2K problem.
How did I get my 15-seconds of fame? I figured out one way to regain use of these wayward Automator Actions, and posted this solution to MAC OS X HINTS. Look here if you want to read the article and its comments.
By the way, I almost got 30-minutes of fame earlier this year when I appeared as an extra in a TV commercial featuring Tiger Woods. Unfortunately, Tiger had his sex scandal thing, and the commercial was probably never aired. That's Show Biz.