I'm no expert, but this cut doesn't make any sense, to me. For the past 20ish years(since I started observing), Interest rates were raised/lowered for 2 reasons:
1) Raise to cool the economy and fight Inflation(De-stimulation)
2) Lower to raise Economic Growth(Stimulation)
The problem at this time, it seems to me, is that Interest rates <5% don't really affect people much. 5% is already hella cheap, if people don't start borrowing at 5ish%, why would they start at 1ish%? Add in the High Debt that most people have and it would seem that the only benefit of practically Free money is in Re-financing of Debt(which could be the real reason?).
Another possibility is that these ridiculously low Rates make Deficit spending much more affordable, but that would take a lot of Political interference, although I'm not sure if the Fed is supposed to be Independent, so it might not be dirty ball.
Yet another possibility might be the continued(new) policy of a low(weaker) $US. As US Interest Rates lower, the $US becomes less attractive to Investors, thus lowering it's value. The advantage of a lower $US is the reduction/elimination of the US Trade Deficit. Though lowering the Trade Deficit eliminates some potential problems, it can create new problems of it's own, especially for the Short-Term.
I don't know what the Fed is trying to accomplish, but as the US economy continues to lag, Canada, the EU, and other economies will begin to suffer(Canadian economy is beginig to slow down) causing those countries to lower their Interest Rates. As they lower theirs, the $US will strengthen eliminating any advantage that a lower $US brings. I think Interest Rates can't go any lower(of course they could, but their lowering will have no benefit).
If those Tax Cuts don't start affecting the Economy soon, I think things are only going to get worse. A good portion, if not all, of the Tax Cuts should have went into Infrastructure Spending, such as Roads, Sewer/Water, or other systems that need upgrading/repair(Federal/State issues notwithstanding). Such spending would have created thousands(perhaps 10s of thousands)of jobs and got the money directly into the Economy where it could do some good, as wells as providing an improved Infrastructure increasing Efficiency.