How low can the rate go? Zero?

As Bernanke announced plans of buying back treasuries, the 10-year yield fell to a record low of 2.72%, and the yield on 3 month treasuries in 0.05%, which is essentially zero!

From Mish's Global Economic Trend Analysis: Helicopter Ben Pulls Out Bazooka




Former Treasury undersecretary Peter Fisher even started to talk about issuing 100-year bonds.

How low can FED slashes the rate? to Zero? We are already there for the short-term, so they are going to bring down the long term yield too. Are we going to be the next Japan?