On October 1, the oldest of the bonds reached its final 30-year maturity. That bond, purchased for $25 in October 1988, had a final maturity value of about $103. Not a fortune, but it returned roughly twice the rate of inflation over its lifetime, which is not bad.
I considered what to do with these bonds, which will now start maturing roughly monthly for a while. I could buy new bonds, but I'd be tying my money up for another minimum term, and the current rates are abysmal. And even so, I still owe federal income tax on the interest earned. (Bond interest isn't taxable until you cash the bonds.) After thinking it over, I decided that I'm just going to take the money and make extra payments toward my consumer-grade debt. That amounts to a decent return on investment right there.
It's not a fortune in bonds (only a few thousands dollars), but I feel good about having managed to hold on to at least some of them all the way to maturity.