I just opened an account at Wachovia Bank (Wells Fargo) for my daughter and the wife just picked up some Savings Bonds for her. They have them in increments of $25, each with different maturity rates. The ones we bought mature in 10 years and will double in value. I was told that their are other bonds that will continue to mature even after 10 years but I'm not sure of the rates/values of those.