* it's surprising how many dishwashers still use spring-loaded timers to sequence their operations. Although at this point mine is 19 years old so maybe that doesn't count.

* Likewise, my iron filter is sequenced by a mechanical timer (run off an electric motor), but my water softener's controller is fully electronic.

* A lot of houses still have mechanical mercury thermostats.

* The flush valve in your toilet tank is completely mechanical and surprisingly complex. Once you take it completely apart you realize that there's more to it than just a float that shuts off a valve.

* I'm always amazed by the centrifugal clutches in weed whackers and small gas-powered lawn appliances.

Should be more things I can come up with...