this article from IBM describes how one can use “continuations” to write simpler, clearer, more powerful web-based applications. It assumes the use of a special programming framework which makes continuations trivial to use. I don’t happen to have access to that framework but it was a cool read because I’d heard about continuations before in my old “learning about lots of obscure and interesting programming languages” habits, but I had never really felt I had understood what they were good for.
Specifically, it discussed the use of “continuation-passing style” which is possible even in languages which do not explicitly facilitate the use of continuations. More on that here.