Tupperware Measuring Pitcher
This pitcher with spout and handle can hold up to 8 cups or 2 liters, with room to spare. The lid has a hinged overhang for storing excess liquid or batter. I use it often for mixing up pancake batter and easily pouring it onto a pan. In case you get nostalgic, maybe even want to buy any, some of these pitchers (and similar) are available on EBay.
Glass Food Jar with Measuring Marks

I use my jar often for making French toast batter (1/2 C milk, 2 eggs, 1 T sugar, 1 t cinnamon), which wets about 4 or 5 slices of bread. My recipe is based on a Betty Crocker paperback recipe, but not easy to find online. A similar and easy recipe is at food.com.
11/6/16--Alas, I broke the jar. It slid off a small appliance and rolled onto the floor.
Braun Kitchen Scale

I recently bought some scales for gifts, picking Taylor 3842-21 at a bricks-n-mortar store. The digital features are nice, and weighs up to 11 pounds (or 5 kg). Good thing about the Braun, though, is not needing to replace batteries.
Crank Can Opener

Coincidentally, more and more cans now come with poptop rings for easy lid removal.
Glassware (Mixing Bowls, Baking Pans)

The mixing bowls have moved with me for several decades and numerous recipes. I omitted the largest bowl from the pic; it's still cradling the remainder of the watermelon I'm still working on consuming.
Kodak DC 3400 Digital Camera

Admittedly, a digital camera is not a kitchen item, I use it as often, maybe more often, than kitchen appliances or gadgets. When I first got it, the camera used to be the cat's meow. Contrasted with today's smartphones, it's now oversized, hefty, and feature-limited. Not planning to abandon it anytime soon. It serves my purposes and is easy to use.
7/8/2016: Sadly, the battery door broke a few months later. Used the camera, temporarily taping and untaping the door to deal with batteries, acquired a Fuji JX665. The Fuji has taken a bit of getting used to, but the additional features and video capability have helped wean me away from the Kodak.
Frequently Used Non-electrical Long-time Kitchen Items (June 2015)
Frequently Used Electrical Long-time Kitchen Items (July 2015)
Frequently Used Kitchen Items--Vintage, Newer (article, video)