A weekly examination of the 49ers' ESPN.com Power Ranking:Preseason ranking: 3 | Last Week: 2 | ESPN.com Power Ranking since 2002What a week for Jim Harbaugh. First, his team beats the Green Bay Packers in Week 1 and Harbaugh is allowed to have a little verbal fun at the expense of Green Bay's Clay Matthews. Now, to kick off a huge rivalry week with NFC West foe Seattle, Harbaugh has been afforded some more ammo. His 49ers are the No.