I'm told that fried lungs are one of the great street foods. Haven't had a chance to try them yet, since North Americans tend to only use organs for dog food and haute cuisine, nothing in between.
I used to work in the same building as a pharmaceutical company that used calf lungs to create medicine for premature babies. So that's another use, at least. And boy did the loading dock where they disposed of the remnants smell bad. Especially in the summer.