The frozen housing market just flashed one of its most promising signs yet that its deep freeze may be ending: mortgage rates are finally coming down, and not just by a small amount. The rate on the 30-year fixed mortgage dropped to its lowest level in about a year in the last week, according to data from the Mortgage Bankers Association.The MBA estimates that the 30-year fixed rate fell 15 basis points to around 6.49% in the week ending September 5. Freddie Mac data also shows that the 30-year fixed rate ...