I have a really high-up kitchen cupboard above my built-in eye-level oven and and microwave. Basically if you imagine a cupboard above a full size fridge you have the picture of what I mean.
I am only 5'3" and I can't easily reach the cupboard so it's no good for anything frequently used. Until now I've used it for tea towels as I could just about reach the edge to get them out and it seemed the less dangerous option because it's not really going to hurt anyone if a pile of towels accidentally fall out! However I've just taken them out and put them elsewhere as they were getting so messy and it wasn't an economical use of space!
DH can reach it more easily so anything we put in there I can always get him to take in and out.
What do you keep in high-up cupboards?!