In a city desperate for good economic news, workers put the final beam in place for a 31-story building on Boston’s waterfront.  When Russia Wharf is completed in 2011, the $500 million glass and steel complex on the Fort Point Channel will be the new home for Wellington Management Co., which has leased 450,000 square feet of office space.  “Despite the global economic recession, Boston is still moving forward,” said Mayor Thomas M. Menino...more.