If I understand CD's correctly they are pretty much the equivalent of GIC's in Canada. If thats the case then after inflation and taxes are factored in you actually lose money. I posted
this on here sometime back in '04 for the Canadians who were using GIC's to stash there cash; it's probably just as relevant to you and CD's.
Of course all this could be wrong

depending on how the U.S. treats CD's for tax purposes. They still suck for after inflation returns though.