You know those little inventions that make life so much easier? Salad spinners. Lemon squeezers. Google maps. Dry shampoo. Pacifiers...Well, I have to say, I ordered a return-address stamp a while back and it's one of those little things that I love using every single time. This sounds dorky, but it gives me a thrill to just stamp our address on letters on be on my way. And it makes our rent check look so fancy!
P.S. United States stamps, and return-address embossers.