I was looking for the best rate on CDs yesterday, when I came across this on U.S. Savings Bonds, series i:
"The Secretary of the Treasury ... determines the fixed rate of return. The fixed rate is established for the life of the bond. The fixed rate will always be greater than or equal to 0.00%. However, the fixed rate is not a guaranteed minimum rate."
Wow. Thanks so much Timothy Geithner! Having you on the job is so reassuring.