Did (or Didn't) Japan Just Re-introduce Quantitative Easing?

With the US Federal Reserve now adopting what is widely regarded as some variant of quantitative easing (QE), and with the Bank of Japan cutting interest rates amidst economic conditions which BoJ Governor Masaaki Shirakawa describes as "severe", perhaps it is worth taking time out to have a looking at some of the earlier experience of quantitative easing in Japan, in order to ask ourselves why