He actually did back in January 17th. But that was just a trial separation of duties, not the official title. Basically, Tim was doing the job ( no puin here, and as he had done successfully twice before when Steve was on sick leave),but not getting the credit. Insiders say that as of that date Steve's presence has been non-existent compared to before. Tim has been running the show. So what will he control as Chairman of the Board? Usually this will be stockholder relations matters. As Chairman he will just conduct the meetings and get one vote as the others do, including Al Gore who is also on the board. The board does not review day to day operations of the company but it does approve budgets, hire the top position, CEO and maybe others per bylaws of the company. The board also reports top the SEC and stock holders as they are elected by the stock holders, one vote per share of common stock.