Interest rates; 0% too much?

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As mentioned time and time again, I know quite a few people, paticulary investors on discounted trackers that would be chuft to bits with an interest rate drop to 0%.
However, I know a lot more people who would not be affected by the drop, thanks to the fixed rate deal they intially took out, so who are the interest rate cuts really helping?

Interest rates; 0% too much?

Can an interest rate of zero be too high? Unfortunately, yes. A new analysis by Goldman Sachs concludes that the Federal Reserve’s cut in the federal funds rate to a record low of zero to 0.25 percent on Dec. 16 isn’t going to be nearly enough to get the economy going again.
The report says the Fed would need to reduce the federal funds rate to negative 6 percent by the end of 2010 to supply the needed amount of monetary stimulus.