Dow Jones on highest level in 2 years, all shares are going to the top today

The Dow Jones and the dollar exchange rate are knowing new levels after the announcement of the extra Fed-boost. The Federal Reserve will buy, from now to June 2010, for 600 milliard dollar Government bonds. The Federal Reserve want to aim the long-term interest rates and stimulate the economy. Will it be a temporary effect or is this really a good decision that will help the economy effective?