The current round of Quantitative Easing has been dubbed by many as QE infinity because it it open ended. The last 2 had fixed amounts of about $1.7 Trillion and $600 Billion respectively, while this one is $40 billion a month until at least the end of this year. Bernanke focused on unemployment and noted in the press conference that this approach is meant to guide the economy back to improvement in the jobs market, and not meant to last until full recovery.
Here are some videos explaining the current round of Fed stimulus:
Financial Times – QE ∞
Here Donald Baillargeon from MoneyTV argues that QE is pretty much a trickle down attempt that is inefficient in creating jobs as Bernanke claims it is for – A Big, Fat, Government Funded QE Party: