Despite signs that several segments of credit continue to improve, namely in the mortgage-backed and investment grade corporate bond market, the rest of the complex remains hostage to nervous money and the accelerated flight to safety in December. U.S. Treasury bonds, the only asset in the world appreciating along with the dollar and the yen since mid-July, have skyrocketed in value since November 18. The yield on the benchmark 10-year Treasury now fetches just 2.54% -- the lowest yield since